U.S. Department of Transportation
Federal Highway Administration
1200 New Jersey Avenue, SE
Washington, DC 20590
202-366-4000
Federal Highway Administration Research and Technology
Coordinating, Developing, and Delivering Highway Transportation Innovations
| REPORT |
| This report is an archived publication and may contain dated technical, contact, and link information |
|
 |
| Publication Number: FHWA-HRT-14-057 Date: February 2018 |
Publication Number: FHWA-HRT-14-057 Date: February 2018 |
When one or more variables of interest do not appear in any models for crash type or land use, numerical estimates of the effect for such variables would clearly not be possible. However, a qualitative assessment may be undertaken. To facilitate such an assessment, this appendix provides the correlations between these variables and the various crash types by land use. Correlation coefficients range between –1.0 and 1.0. A positive coefficient indicates that higher values of a variable are correlated with a higher crash frequency. A negative coefficient indicates that higher values of a variable are correlated with a lower crash frequency. The closer the coefficient is to –1.0 or 1.0, the stronger the correlation.
To provide a point of reference for comparison, the parameter estimates and p-values are also provided with the correlation coefficients. The parameter estimates are based on a restricted model in which only traffic volume and the variable of interest are included. When the correlation coefficient and the parameter estimate differ (i.e., opposite signs), it may be an indication that other factors are confounding the results or that the association is not statistically significant. The correlation coefficients are presented in table 87 through table 89.
Table 87. Correlation coefficients for mixed land use.
| Variable Name | Variable Description | Total (Parameter Estimate, p-Value) |
Injury (Parameter Estimate, p-Value) |
Rear-End (Parameter Estimate, p-Value) | Right-Angle (Parameter Estimate, p-Value) | Turning (Parameter Estimate, p-Value) |
|---|---|---|---|---|---|---|
| PROPLIGHT | Proportion of total length with illumination present | 0.12 (0.2109, 0.3593) |
0.11 (0.0492, 0.8247) |
0.09 (0.0390, 0.8834) |
0.11 (0.2229, 0.2796) |
0.15 (0.6249, 0.0232) |
| PROPPOORPVMNT | Proportion of total length with a poor pavement condition | 0.18 (0.3568, 0.4024) |
0.06 (0.1075, 0.7926) |
0.15 (0.3138, 0.5180) |
0.48 (0.7756, 0.1035) |
0.06 (0.4449, 0.3776) |
| PROPLIMCONN | Proportion of total length with limited connectivity on adjacent developments | –0.07 (–0.1457, 0.5014) |
–0.06 (0.0089, 0.9656) |
–0.08 (–0.3030, 0.2214) |
0.05 (0.2782, 0.2739) |
–0.10 (–0.4870, 0.0553) |
| PROPMODCONN | Proportion of total length with moderate connectivity on adjacent developments | 0.17 (–0.1189, 0.6728) |
0.20 (–0.2911, 0.2679) |
0.17 (–0.1012, 0.7528) |
0.04 (–0.4727, 0.1569) |
0.21 (–0.2094, 0.5320) |
| PROPSIGCONN | Proportion of total length with significant connectivity on adjacent developments | –0.07 (0.2455, 0.2968) |
–0.11 (0.1838, 0.4053) |
–0.06 (0.4078, 0.1318) |
–0.08 (–0.0199, 0.9418) |
–0.07 (0.6993, 0.0130) |
| PROPFRONTRD | Proportion of total length with a frontage road | 0.01 (0.0607, 0.8075) |
0.03 (0.2803, 0.2291) |
0.02 (0.2051, 0.4679) |
0.03 (0.2837, 0.3428) |
–0.04 (–0.8360, 0.0051) |
| NOCOMFULLDRWY | Number of commercial full-movement driveways | 0.27 (–0.0002, 0.8585) |
0.35 (0.0001, 0.9227) |
0.15 (–0.0016, 0.2533) |
0.28 (0.0012, 0.5580) |
0.38 (0.0009, 0.5726) |
| NORESFULLDRWY | Number of residential full movement driveways | 0.05 (–0.0017, 0.6556) |
0.11 (–0.0000, 0.9951) |
–0.01 (–0.0042, 0.3288) |
0.06 (–0.0019, 0.6974) |
0.13 (0.0033, 0.4678) |
| NOCOMLIMDRWY | Number of commercial limited-movement driveways | 0.86 (0.0024, 0.0857) |
0.89 (0.0018, 0.1385) |
0.87 (0.0026, 0.0962) |
0.56 (0.0010, 0.4827) |
0.90 (0.0029, 0.0899) |
| NORESLIMDRWY | Number of residential limited-movement driveways | 0.06 (–0.0015, 0.4638) |
0.11 (–0.0001, 0.9756) |
0.05 (–0.0016, 0.5224) |
0.06 (–0.0004, 0.8502) |
0.04 (–0.0029, 0.2360) |
| NO3LEGUNSIG | Number of 3-legged unsignalized intersections | 0.85 (0.0103, 0.0888) |
0.89 (0.0089, 0.0055) |
0.81 (0.0094, 0.1585) |
0.65 (0.0066, 0.3623) |
0.90 (0.0142, 0.0481) |
| NO4LEGUNSIG | Number of 4-legged unsignalized intersections | 0.65 (0.0069, 0.4954) |
0.69 (0.0053, 0.5722) |
0.57 (–0.0021, 0.8450) |
0.64 (0.0218, 0.0835) |
0.69 (0.0150, 0.2225) |
| NO5LEGUNSIG | Number of 5-legged unsignalized intersections | 0.00 (0.0761, 0.8897) |
–0.03 (–0.1247, 0.8119) |
–0.02 (–0.4720, 0.4528) |
0.04 (0.3213, 0.6175) |
–0.03 (0.1376, 0.8375) |
| NO3LEGFULLUNSIG | Number of 3-legged full-movement unsignalized intersections | 0.39 (0.0036, 0.7052) |
0.44 (0.0041, 0.6345) |
0.29 (–0.0045, 0.6610) |
0.37 (0.0047, 0.6841) |
0.47 (0.0171, 0.1445) |
| NO3LEGLIMUNSIG | Number of 3-legged limited movement unsignalized intersections | 0.88 (0.0172, 0.0734) |
0.88 (0.0142, 0.1040) |
0.89 (0.0227, 0.0549) |
0.60 (0.0079, 0.4378) |
0.86 (0.0138, 0.1690) |
| NO3LEGRIROUNSIG | Number of 3-legged right-in/right-out unsignalized intersections | 0.88 (0.0180, 0.0754) |
0.88 (0.0144, 0.1128) |
0.89 (0.0235, 0.0592) |
0.59 (0.0078, 0.4595) |
0.87 (0.0151, 0.1581) |
| NO3LEGLFMOUNSIG | Number of 3-legged unsignalized intersections with no left-turn movement from crossroad | 0.61 (0.1883, 0.1140) |
0.60 (0.2098, 0.0654) |
0.64 (0.2621, 0.0508) |
0.49 (0.1881, 0.2265) |
0.55 (0.0613, 0.6445) |
| NO4LEGFULLUNSIG | Number of 4-legged full-movement unsignalized intersections | 0.66 (0.0082, 0.4250) |
0.69 (0.0064, 0.5051) |
0.57 (–0.0013, 0.9048) |
0.65 (0.0246, 0.0559) |
0.70 (0.0157, 0.2093) |
| NO4LEGLIMUNSIG | Number of 4-legged limited-movement unsignalized intersections | 0.20 (0.0903, 0.6560) |
0.21 (0.1464, 0.4419) |
0.22 (0.1523, 0.5239) |
0.11 (–0.0432, 0.8544) |
0.19 (0.3162, 0.1808) |
| NO4LEGRIROUNSIG | Number of 4-legged right-in/right-out unsignalized intersections | –0.07 (0.1024, 0.8193) |
–0.06 (0.1957, 0.6442) |
–0.06 (0.2873, 0.5759) |
–0.09 (–0.0608, 0.9124) |
–0.05 (0.4693, 0.3911) |
| NO4LEGLFMOUNSIG | Number of 4-legged unsignalized intersections with no left-turn movement from crossroad | 0.30 (0.1131, 0.6628) |
0.31 (0.1643, 0.4877) |
0.32 (0.1318, 0.6486) |
0.19 (–0.0497, 0.8651) |
0.29 (0.4521, 0.1764) |
| NORTLUNSIG | Number of unsignalized intersections with a right-turn lane | –0.01 (–0.0345, 0.3565) |
–0.06 (–0.0092, 0.8020) |
0.03 (–0.0164, 0.7207) |
0.05 (–0.0393, 0.3377) |
–0.12 (–0.1404, 0.0015) |
| NOLTLUNSIG | Number of unsignalized intersections with a left-turn lane | 0.65 (0.0045, 0.4877) |
0.69 (0.0038, 0.5200) |
0.57 (0.0022, 0.7608) |
0.53 (0.0019, 0.8053) |
0.71 (0.0136, 0.0986) |
| MINSPCSIG | Minimum spacing of signalized intersections (feet) | –0.18 (–0.0001, 0.2238) |
–0.21 (–0.0001, 0.2606) |
–0.16 (–0.0001, 0.3579) |
–0.20 (–0.0002, 0.1127) |
–0.21 (–0.0002, 0.0748) |
| MAXSPCSIG | Maximum spacing of signalized intersections (feet) | –0.07 (–0.0001, 0.0080) |
–0.10 (–0.0001, 0.0148) |
–0.07 (–0.0001, 0.0307) |
–0.04 (–0.0002, 0.0004) |
–0.10 (–0.0001, 0.1473) |
| NO3LEGSIG | Number of 3-legged signalized intersections | 0.58 (–0.0030, 0.9401) |
0.64 (0.0151, 0.7073) |
0.58 (0.0086, 0.8523) |
0.34 (–0.0668, 0.1360) |
0.62 (0.0202, 0.6778) |
| NO4LEGSIG | Number of 4-legged signalized intersections | 0.79 (0.0123, 0.2144) |
0.86 (0.0148, 0.1223) |
0.72 (0.0102, 0.3575) |
0.63 (0.0143, 0.2582) |
0.84 (0.0164, 0.1493) |
| NO5LEGSIG | Number of 5-legged signalized intersections | 0.10 (0.1471, 0.5172) |
0.12 (0.1829, 0.3874) |
0.04 (0.0121, 0.9627) |
0.10 (0.1764, 0.5119) |
0.14 (0.2217, 0.4102) |
| NORTLSIG | Number of signalized intersections with a right-turn lane on the mainline | 0.77 (0.0194, 0.3966) |
0.77 (0.0292, 0.2023) |
0.80 (0.0450, 0.1185) |
0.55 (–0.0129, 0.5961) |
0.71 (0.0057, 0.8113) |
| NOLTLSIG | Number of signalized intersections with a left-turn lane on the mainline | 0.79 (0.0094, 0.2824) |
0.86 (0.0110, 0.1916) |
0.74 (0.0100, 0.3275) |
0.59 (0.0041, 0.6898) |
0.86 (0.0142, 0.1681) |
| MEDOPLT | Number of median openings with a left-turn lane | 0.35 (–0.0046, 0.7770) |
0.47 (–0.0003, 0.9818) |
0.27 (–0.0080, 0.6698) |
0.15 (–0.0146, 0.4047) |
0.49 (0.0028, 0.8818) |
| MEDOPNOLT | Number of median openings without a left-turn lane | –0.03 (–0.1235, 0.2862) |
0.00 (–0.0925, 0.4038) |
–0.02 (–0.1431, 0.2643) |
–0.02 (0.0506, 0.7439) |
–0.06 (–0.2342, 0.0753) |
| SPEED_LIMIT | Posted speed limit (miles per hour) | 0.00 (–0.0253, 0.0471) |
–0.02 (–0.0219, 0.0717) |
0.05 (–0.0095, 0.5406) |
–0.15 (–0.0597, <0.0001) |
–0.04 (–0.0324, 0.0629) |
| SPCOFFLT | Minimum spacing from off-ramp to left turn onto mainline from same side of road (feet) | –0.14 (–0.0000, 0.8225) |
–0.15 (0.0000, 0.9214) |
–0.07 (–0.0001, 0.7111) |
–0.07 (0.0001, 0.6344) |
–0.22 (–0.0006, 0.0294) |
| SPCOFFRT | Minimum spacing from off-ramp to right turn onto mainline from same side of road (feet) | –0.10 (–0.0002, 0.4140) |
–0.13 (–0.0000, 0.8689) |
0.02 (–0.0002, 0.5206) |
–0.05 (–0.0001, 0.6079) |
–0.23 (–0.0008, 0.0110) |
| SPCON | Minimum spacing from on-ramp to right turn onto mainline from same side of road (feet) | –0.19 (–0.0004, 0.1529) |
–0.18 (–0.0003, 0.1464) |
–0.14 (–0.0002, 0.4334) |
–0.20 (–0.0005, 0.0463) |
–0.20 (–0.0008, 0.0155) |
Table 88. Correlation coefficients for commercial land use.
| Variable Name | Variable Description | Total (Parameter Estimate, p-Value) |
Injury (Parameter Estimate, p-Value) |
Rear-End (Parameter Estimate, p-Value) | Right-Angle (Parameter Estimate, p-Value) | Turning (Parameter Estimate, p-Value) |
|---|---|---|---|---|---|---|
| PROPLIGHT | Proportion of total length with illumination present | 0.16 (0.4145, 0.0326) |
0.14 (0.1854, 0.3290) |
0.08 (0.2781, 0.2038) |
0.18 (0.7569, 0.0033) |
0.26 (0.7765, 0.0024) |
| PROPPOORPVMNT | Proportion of total length with a poor pavement condition | –0.07 (–0.2922, 0.6281) |
–0.08 (–0.0709, 0.9013) |
–0.12 (–0.8809, 0.1469) |
0.06 (0.5952, 0.5056) |
–0.09 (–0.1403, 0.8625) |
| PROPLIMCONN | Proportion of total length with limited connectivity on adjacent developments | 0.04 (–0.0245, 0.9095) |
0.07 (–0.0430, 0.8415) |
0.04 (–0.0396, 0.8643) |
–0.03 (–0.0203, 0.9476) |
0.04 (–0.2369, 0.4057) |
| PROPMODCONN | Proportion of total length with moderate connectivity on adjacent developments | –0.05 (–0.0364, 0.8712) |
0.03 (0.2718, 0.2157) |
–0.04 (–0.0741, 0.7602) |
–0.04 (–0.0981, 0.7601) |
–0.04 (–0.1183, 0.6871) |
| PROPSIGCONN | Proportion of total length with significant connectivity on adjacent developments | 0.03 (0.1199, 0.5719) |
–0.08 (–0.1332, 0.5133) |
0.02 (0.1768, 0.4349) |
0.09 (0.1613, 0.5785) |
0.02 (0.4443, 0.1314) |
| PROPFRONTRD | Proportion of total length with a frontage road | 0.01 (–0.2573, 0.2064) |
0.07 (–0.0160, 0.9360) |
0.09 (–0.1630, 0.4617) |
–0.06 (–0.3225, 0.2517) |
–0.10 (–0.8573, 0.0009) |
| NOCOMFULLDRWY | Number of commercial full-movement driveways | 0.47 (0.0019, 0.2220) |
0.56 (0.0026, 0.0977) |
0.33 (0.0008, 0.6343) |
0.37 (0.0030, 0.1655) |
0.62 (0.0031, 0.1304) |
| NORESFULLDRWY | Number of residential full-movement driveways | 0.17 (–0.0017, 0.8362) |
0.20 (0.0025, 0.7446) |
0.10 (–0.0058, 0.5255) |
0.18 (0.0071, 0.5264) |
0.22 (0.0030, 0.7869) |
| NOCOMLIMDRWY | Number of commercial limited-movement driveways | 0.57 (0.0010, 0.3816) |
0.61 (0.0004, 0.7144) |
0.54 (0.0008, 0.4769) |
0.29 (0.0005, 0.7386) |
0.65 (0.0009, 0.5184) |
| NORESLIMDRWY | Number of residential limited-movement driveways | 0.37 (–0.0022, 0.9127) |
0.38 (–0.0101, 0.5861) |
0.37 (–0.0006, 0.9774) |
0.21 (–0.0140, 0.5867) |
0.32 (–0.0074, 0.7660) |
| NO3LEGUNSIG | Number of 3-legged unsignalized intersections | 0.67 (0.0041, 0.4363) |
0.74 (0.0031, 0.5586) |
0.59 (0.0022, 0.6950) |
0.39 (0.0016, 0.8127) |
0.76 (0.0062, 0.3703) |
| NO4LEGUNSIG | Number of 4-legged unsignalized intersections | 0.49 (0.0169, 0.2476) |
0.50 (0.0176, 0.2297) |
0.37 (0.0070, 0.6449) |
0.43 (0.0293, 0.1586) |
0.56 (0.0284, 0.1560) |
| NO5LEGUNSIG | Number of 5-legged unsignalized intersections | –0.02 (–0.4711, 0.5265) |
–0.04 (–0.5110, 0.4751) |
–0.02 (–0.4150, 0.6085) |
0.01 (–0.4889, 0.6170) |
–0.05 (–0.9245, 0.3389) |
| NO3LEGFULLUNSIG | Number of 3-legged full-movement unsignalized intersections | 0.53 (0.0050, 0.5404) |
0.58 (0.0037, 0.6404) |
0.40 (–0.0008, 0.9258) |
0.38 (0.0065, 0.5468) |
0.63 (0.0104, 0.3336) |
| NO3LEGLIMUNSIG | Number of 3-legged limited-movement unsignalized intersections | 0.58 (0.0056, 0.5640) |
0.64 (0.0038, 0.6898) |
0.58 (0.0073, 0.4904) |
0.26 (–0.0048, 0.7047) |
0.62 (0.0042, 0.7302) |
| NO3LEGRIROUNSIG | Number of 3-legged right-in/right-out unsignalized intersections | 0.55 (0.0058, 0.5835) |
0.62 (0.0041, 0.6951) |
0.56 (0.0081, 0.4845) |
0.25 (–0.0060, 0.6660) |
0.60 (0.0043, 0.7462) |
| NO3LEGLFMOUNSIG | Number of 3-legged unsignalized intersections with no left-turn movement from crossroad | 0.56 (0.0516, 0.5438) |
0.61 (0.0256, 0.7483) |
0.57 (0.0346, 0.6991) |
0.31 (0.0264, 0.8269) |
0.54 (0.0408, 0.7025) |
| NO4LEGFULLUNSIG | Number of 4-legged full-movement unsignalized intersections | 0.48 (0.0169, 0.2475) |
0.50 (0.0181, 0.2192) |
0.36 (0.0069, 0.6468) |
0.42 (0.0298, 0.1529) |
0.56 (0.0279, 0.1601) |
| NO4LEGLIMUNSIG | Number of 4-legged limited-movement unsignalized intersections | 0.12 (–0.0492, 0.8217) |
0.03 (–0.1666, 0.4353) |
0.18 (–0.0250, 0.9150) |
0.09 (–0.1863, 0.5236) |
–0.01 (–0.0105, 0.9711) |
| NO4LEGRIROUNSIG | Number of 4-legged right-in/right-out unsignalized intersections | –0.05 (–0.0097, 0.9821) |
–0.07 (–0.2114, 0.6155) |
–0.05 (0.0273, 0.9539) |
–0.08 (–0.4710, 0.4173) |
0.00 (0.4605, 0.4045) |
| NO4LEGLFMOUNSIG | Number of 4-legged unsignalized intersections with no left-turn movement from crossroad | 0.21 (–0.0748, 0.8173) |
0.10 (–0.2838, 0.3383) |
0.30 (–0.0006, 0.9987) |
0.15 (–0.2691, 0.5276) |
0.00 (–0.3835, 0.3787) |
| NORTLUNSIG | Number of unsignalized intersections with a right-turn lane | 0.32 (–0.0295, 0.3326) |
0.32 (–0.0079, 0.7884) |
0.43 (–0.0151, 0.6427) |
0.23 (–0.0565, 0.1662) |
0.03 (–0.0961, 0.0136) |
| NOLTLUNSIG | Number of unsignalized intersections with a left-turn lane | 0.64 (0.0078, 0.2643) |
0.68 (0.0070, 0.3137) |
0.52 (0.0027, 0.7058) |
0.48 (0.0109, 0.2623) |
0.72 (0.0138, 0.1445) |
| MINSPCSIG | Minimum spacing of signalized intersections (feet) | –0.21 (–0.0002, 0.0012) |
–0.22 (–0.0002, 0.0008) |
–0.16 (–0.0001, 0.0343) |
–0.22 (–0.0003, 0.0003) |
–0.23 (–0.0002, 0.0006) |
| MAXSPCSIG | Maximum spacing of signalized intersections (feet) | 0.23 (–0.0001, 0.0016) |
0.21 (–0.0001, 0.0096) |
0.29 (–0.0001, 0.0031) |
0.16 (–0.0001, 0.0036) |
–0.03 (–0.0001, <0.0001) |
| NO3LEGSIG | Number of 3-legged signalized intersections | 0.38 (0.0069, 0.8363) |
0.40 (–0.0068, 0.8345) |
0.32 (0.0008, 0.9820) |
0.21 (–0.0117, 0.7833) |
0.45 (0.0265, 0.5507) |
| NO4LEGSIG | Number of 4-legged signalized intersections | 0.75 (0.0140, 0.1905) |
0.83 (0.0151, 0.1631) |
0.67 (0.0069, 0.5435) |
0.51 (0.0194, 0.2044) |
0.83 (0.0199, 0.1519) |
| NO5LEGSIG | Number of 5-legged signalized intersections | 0.03 (0.0276, 0.8297) |
0.05 (0.0335, 0.7782) |
0.04 (0.0649, 0.6429) |
–0.04 (–0.0478, 0.7742) |
0.06 (0.0081, 0.9605) |
| NORTLSIG | Number of signalized intersections with a right-turn lane on the mainline | 0.51 (–0.0009, 0.9743) |
0.54 (0.0085, 0.7480) |
0.60 (0.0126, 0.6835) |
0.31 (–0.0294, 0.4072) |
0.32 (–0.0123, 0.7136) |
| NOLTLSIG | Number of signalized intersections with a left-turn lane on the mainline | 0.73 (0.0107, 0.2585) |
0.80 (0.0103, 0.2821) |
0.65 (0.0055, 0.5827) |
0.46 (0.0125, 0.3548) |
0.81 (0.0169, 0.1727) |
| MEDOPLT | Number of median openings with a left-turn lane | 0.54 (0.0053, 0.6656) |
0.58 (–0.0001, 0.9963) |
0.55 (0.0051, 0.7064) |
0.23 (–0.0061, 0.6960) |
0.54 (0.0026, 0.8714) |
| MEDOPNOLT | Number of median openings without a left-turn lane | 0.26 (0.0008, 0.9867) |
0.30 (–0.0171, 0.7046) |
0.23 (–0.0047, 0.9293) |
0.09 (–0.0377, 0.5061) |
0.28 (–0.0269, 0.6578) |
| SPEED_LIMIT | Posted speed limit (miles per hour) | –0.02 (–0.0175, 0.1768) |
–0.08 (–0.0151, 0.1792) |
0.13 (–0.0053, 0.7165) |
–0.07 (–0.0420, 0.0105) |
–0.26 (–0.0422, 0.0191) |
| SPCOFFLT | Minimum spacing from off-ramp to left turn onto mainline from same side of road (feet) | –0.27 (–0.0009, <0.0001) |
–0.26 (–0.0009, 0.0004) |
–0.26 (–0.0009, <0.0001) |
–0.15 (–0.0009, 0.0238) |
–0.34 (–0.0016, <0.0001) |
| SPCOFFRT | Minimum spacing from off-ramp to right turn onto mainline from same side of road (feet) | –0.23 (–0.0007, 0.0098) |
–0.28 (–0.0007, 0.0094) |
–0.18 (–0.0007, 0.0056) |
–0.05 (–0.0005, 0.2349) |
–0.39 (–0.0013, 0.0022) |
| SPCON | Minimum spacing from on-ramp to right turn onto mainline from same side of road (feet) | –0.24 (–0.0003, 0.0753) |
–0.31 (–0.0003, 0.1818) |
–0.09 (–0.0002, 0.1939) |
–0.12 (–0.0004, 0.1588) |
–0.43 (–0.0009, 0.0017) |
Table 89. Correlation coefficients for residential land use.
| Variable Name | Variable Description | Total (Parameter Estimate, p-Value) |
Injury (Parameter Estimate, p-Value) |
Rear-End (Parameter Estimate, p-Value) | Right-Angle (Parameter Estimate, p-Value) | Turning (Parameter Estimate, p-Value) |
|---|---|---|---|---|---|---|
| PROPLIGHT | Proportion of total length with illumination present | 0.02 (0.2319, 0.1731) |
0.00 (0.2602, 0.1186) |
–0.06 (0.0437, 0.8293) |
0.08 (0.4518, 0.0547) |
0.15 (0.8585, <0.0001) |
| PROPPOORPVMNT | Proportion of total length with a poor pavement condition | 0.04 (–0.0015, 0.9980) |
–0.02 (–0.1620, 0.7781) |
0.02 (–0.0690, 0.9248) |
0.15 (0.7495, 0.3475) |
–0.03 (0.0705, 0.9245) |
| PROPLIMCONN | Proportion of total length with limited connectivity on adjacent developments | –0.08 (–0.1159, 0.5396) |
–0.12 (–0.2165, 0.2404) |
–0.10 (–0.0907, 0.6841) |
–0.07 (–0.3227, 0.2118) |
–0.08 (–0.5314, 0.0344) |
| PROPMODCONN | Proportion of total length with moderate connectivity on adjacent developments | 0.18 (0.1387, 0.5941) |
0.27 (0.1547, 0.5494) |
0.24 (0.3923, 0.2023) |
–0.08 (–0.5664, 0.1228) |
0.26 (0.6023, 0.0709) |
| PROPSIGCONN | Proportion of total length with significant connectivity on adjacent developments | –0.06 (0.0549, 0.8012) |
–0.09 (0.1799, 0.4012) |
–0.08 (–0.1831, 0.4797) |
0.14 (0.7085, 0.0153) |
–0.12 (0.1949, 0.4985) |
| PROPFRONTRD | Proportion of total length with a frontage road | 0.21 (0.2815, 0.1540) |
0.31 (0.3999, 0.0404) |
0.24 (0.2748, 0.2571) |
0.08 (0.5250, 0.0500) |
0.11 (–0.2668, 0.3005) |
| NOCOMFULLDRWY | Number of commercial full-movement driveways | 0.44 (–0.0006, 0.9051) |
0.38 (–0.0012, 0.8194) |
0.28 (–0.0042, 0.4789) |
0.40 (0.0036, 0.6334) |
0.49 (–0.0022, 0.7449) |
| NORESFULLDRWY | Number of residential full-movement driveways | 0.29 (0.0011, 0.4183) |
0.18 (0.0009, 0.5606) |
0.11 (–0.0007, 0.6470) |
0.36 (0.0024, 0.1820) |
0.29 (0.0015, 0.4259) |
| NOCOMLIMDRWY | Number of commercial limited-movement driveways | 0.27 (–0.0112, 0.2353) |
0.38 (–0.0091, 0.2842) |
0.26 (–0.0075, 0.5070) |
0.08 (–0.0158, 0.2164) |
0.33 (–0.0159, 0.1738) |
| NORESLIMDRWY | Number of residential limited-movement driveways | 0.11 (–0.0121, 0.0529) |
0.25 (–0.0093, 0.1029) |
0.10 (–0.0112, 0.1311) |
–0.03 (–0.0152, 0.0700) |
0.21 (–0.0127, 0.1120) |
| NO3LEGUNSIG | Number of 3-legged unsignalized intersections | 0.33 (–0.0157, 0.0384) |
0.31 (–0.0148, 0.0452) |
0.24 (–0.0200, 0.0226) |
0.31 (–0.0099, 0.3571) |
0.31 (–0.0112, 0.2864) |
| NO4LEGUNSIG | Number of 4-legged unsignalized intersections | 0.35 (–0.0079, 0.6507) |
0.24 (–0.0129, 0.4485) |
0.19 (–0.0289, 0.1447) |
0.49 (0.0251, 0.3096) |
0.16 (–0.0102, 0.6888) |
| NO5LEGUNSIG | Number of 5-legged unsignalized intersections | –0.11 (–0.8966, 0.0245) |
–0.10 (–0.7390, 0.0678) |
–0.11 (–1.0360, 0.0285) |
–0.06 (–0.5482, 0.3516) |
–0.08 (–1.0205, 0.0562) |
| NO3LEGFULLUNSIG | Number of 3-legged full-movement unsignalized intersections | 0.20 (–0.0238, 0.0085) |
0.16 (–0.0211, 0.0152) |
0.11 (–0.0292, 0.0053) |
0.22 (–0.0215, 0.0944) |
0.19 (–0.0228, 0.0778) |
| NO3LEGLIMUNSIG | Number of 3-legged limited-movement unsignalized intersections | 0.37 (0.0045, 0.8554) |
0.47 (0.0085, 0.7078) |
0.35 (0.0060, 0.8351) |
0.20 (0.0198, 0.5954) |
0.36 (0.0060, 0.8618) |
| NO3LEGRIROUNSIG | Number of 3-legged right-in/right-out unsignalized intersections | 0.38 (0.0074, 0.7777) |
0.47 (0.0115, 0.6306) |
0.36 (0.0088, 0.7703) |
0.21 (0.0251, 0.5197) |
0.36 (0.0088, 0.8089) |
| NO3LEGLFMOUNSIG | Number of 3-legged unsignalized intersections with no left-turn movement from crossroad | 0.14 (–0.2607, 0.3209) |
0.25 (–0.2215, 0.3615) |
0.10 (–0.3207, 0.2815) |
0.05 (–0.2915, 0.4250) |
0.23 (–0.1280, 0.7161) |
| NO4LEGFULLUNSIG | Number of 4-legged full-movement unsignalized intersections | 0.35 (–0.0092, 0.5924) |
0.25 (–0.0138, 0.4129) |
0.19 (–0.0296, 0.1289) |
0.49 (0.0246, 0.3141) |
0.17 (–0.0148, 0.5494) |
| NO4LEGLIMUNSIG | Number of 4-legged limited-movement unsignalized intersections | –0.11 (0.5549, 0.1302) |
–0.13 (0.5363, 0.1799) |
–0.09 (0.5176, 0.2338) |
–0.09 (0.0112, 0.9850) |
–0.07 (1.2080, 0.0063) |
| NO4LEGRIROUNSIG | Number of 4-legged right-in/right-out unsignalized intersections | –0.11 (0.5549, 0.1302) |
–0.13 (0.5363, 0.1799) |
–0.09 (0.5176, 0.2338) |
–0.09 (0.0112, 0.9850) |
–0.07 (1.2080, 0.0063) |
| NO4LEGLFMOUNSIG | Number of 4-legged unsignalized intersections with no left-turn movement from crossroad | — | — | — | — | — |
| NORTLUNSIG | Number of unsignalized intersections with a right-turn lane | 0.08 (–0.0831, 0.0007) |
0.05 (–0.0671, 0.0045) |
0.08 (–0.0987, 0.0023) |
0.09 (–0.1015, 0.0020) |
–0.15 (–0.1352, <0.0001) |
| NOLTLUNSIG | Number of unsignalized intersections with a left-turn lane | 0.18 (–0.0131, 0.2162) |
0.14 (–0.0206, 0.0438) |
0.11 (–0.0135, 0.2819) |
0.14 (–0.0072, 0.6220) |
0.34 (–0.0026, 0.8561) |
| MINSPCSIG | Minimum spacing of signalized intersections (feet) | –0.34 (–0.0002, 0.0053) |
–0.33 (–0.0002, 0.0022) |
–0.22 (–0.0001, 0.1095) |
–0.33 (–0.0003, <0.0001) |
–0.31 (–0.0001, 0.3429) |
| MAXSPCSIG | Maximum spacing of signalized intersections (feet) | 0.21 (–0.0001, 0.0096) |
0.19 (–0.0001, 0.0124) |
0.21 (–0.0001, 0.0771) |
0.09 (–0.0001, 0.0558) |
0.23 (–0.0001, 0.0384) |
| NO3LEGSIG | Number of 3-legged signalized intersections | 0.37 (0.0284, 0.6507) |
0.45 (0.0710, 0.2392) |
0.36 (0.0642, 0.3957) |
0.22 (–0.0198, 0.8114) |
0.35 (–0.0116, 0.8834) |
| NO4LEGSIG | Number of 4-legged signalized intersections | 0.69 (0.0394, 0.1479) |
0.73 (0.0558, 0.0324) |
0.54 (0.0134, 0.6604) |
0.63 (0.1127, 0.0028) |
0.52 (0.0292, 0.4357) |
| NO5LEGSIG | Number of 5-legged signalized intersections | 0.11 (0.6930, 0.3056) |
0.00 (0.0381, 0.9547) |
–0.01 (0.0881, 0.9124) |
0.09 (1.1129, 0.2223) |
0.28 (0.7192, 0.4027) |
| NORTLSIG | Number of signalized intersections with a right-turn lane on the mainline | 0.63 (–0.0063, 0.8532) |
0.61 (–0.0018, 0.9555) |
0.64 (0.0264, 0.5102) |
0.48 (–0.0089, 0.8388) |
0.28 (–0.0989, 0.0228) |
| NOLTLSIG | Number of signalized intersections with a left-turn lane on the mainline | 0.62 (–0.0026, 0.9107) |
0.67 (0.0051, 0.8111) |
0.59 (0.0082, 0.7650) |
0.50 (0.0166, 0.6044) |
0.39 (–0.0273, 0.3513) |
| MEDOPLT | Number of median openings with a left-turn lane | 0.10 (–0.0186, 0.5991) |
0.26 (–0.0101, 0.7715) |
0.06 (–0.0269, 0.5045) |
–0.01 (–0.0408, 0.3383) |
0.28 (0.0342, 0.5411) |
| MEDOPNOLT | Number of median openings without a left-turn lane | –0.15 (–0.3795, 0.1112) |
–0.11 (–0.1744, 0.4988) |
–0.18 (–0.6913, 0.0098) |
–0.03 (0.1194, 0.6994) |
–0.08 (–0.3801, 0.2128) |
| SPEED_LIMIT | Posted speed limit (miles per hour) | 0.08 (0.0001, 0.9935) |
0.11 (0.0010, 0.9240) |
0.19 (0.0129, 0.3338) |
–0.10 (–0.0210, 0.1560) |
0.06 (–0.0098, 0.5050) |
| SPCOFFLT | Minimum spacing from off-ramp to left turn onto mainline from same side of road (feet) | 0.28 (0.0032, 0.0020) |
0.39 (0.0033, 0.0015) |
0.20 (0.0046, 0.0042) |
0.32 (0.0039, 0.0149) |
0.31 (0.0019, 0.0634) |
| SPCOFFRT | Minimum spacing from off-ramp to right turn onto mainline from same side of road (feet) | 0.07 (0.0025, 0.0117) |
0.20 (0.0024, 0.0179) |
–0.01 (0.0032, 0.0244) |
0.11 (0.0022, 0.1459) |
0.28 (0.0016, 0.0817) |
| SPCON | Minimum spacing from on-ramp to right turn onto mainline from same side of road (feet) | –0.48 (0.0012, 0.2278) |
–0.46 (0.0001, 0.9015) |
–0.30 (0.0030, 0.0115) |
–0.60 (–0.0044, 0.0294) |
–0.27 (–0.0043, 0.0002) |
| —Unavailable. | ||||||
