Recommended Best Practices for the Use of the FHWA Traffic Noise Model (TNM)

Appendix C. Detailed Traffic Distributions

Table of traffic distributions. Original source table follows for screen readers only.

Area:		ALL						Rural						Urban
Facility:		4-Lane		8-Lane				4-Lane		8-Lane				4-Lane		8-Lane				12-Lane
Lane:		1 (out)	2	1 (out)	2	3	4	1 (out)	2	1 (out)	2	3	4	1 (out)	2	1 (out)	2	3	4	1 (out)	2	3	4	5	6 (HOV)
ALL	Lane % MT+Bus	81.8	18.2	43.5	36.4	16.1	3.9	85	15	42	46.9	10	1.2	65.1	34.9	43.7	35.1	16.8	4.3	17.2	17.6	34.6	25.2	1.9	3.4
	Lane % HT	75.5	24.5	43.7	44.3	10.4	1.6	81.4	18.6	55.6	44.2	0.2	0	48.4	51.6	42.2	44.3	11.7	1.8	8.4	17.4	37.5	34.6	1.8	0.3
	Lane % Trucks	76.8	23.2	42.9	42.1	12.4	2.5	82.1	17.9	50.5	45.1	4	0.4	52.6	47.4	42	41.8	13.5	2.8	10.8	17.6	36.9	31.5	1.9	1.3
	Lane % Car	56.4	43.6	31.4	26.5	28.3	13.8	59	41	29.8	21.3	29.4	19.4	50.8	49.2	31.6	27.1	28.1	13.1	13.9	18.4	25.7	24.8	16.3	0.8
	% Total Traffic	60	40	32.6	28.6	26.4	12.4	62.6	37.4	31.2	23	27.7	18.1	51	49	32.8	29.3	26.2	11.7	13.6	18.3	26.9	25.4	14.9	0.9
N in Dataset		16		18				12		2				2		16				4
With Lower (Typical) Truck Percentage	Lane % MT+Bus	81.8	18.2	38.1	40.5	17.3	4.1
	Lane % HT	76.9	23.1	49.4	35.8	11.8	3.1
	Lane % Trucks	77.7	22.3	44.2	38.5	13.7	3.6
	Lane % Car	53	47	30.4	26.5	29.1	14
	% Total Traffic	55.3	44.7	31.5	27.6	27.8	13.1
Dataset Truck Percentages		7-14%; 10% avg		6%-9%; 8% avg				7%-14%		Minimum: 6%				14%		Minimum: 6%				Minimum: 8%
With Higher Truck Percentage	Lane % MT+Bus	82.8	17.2	49	32.3	14.9	3.8
	Lane % HT	74.7	25.3	38.1	52.7	9	0.2
	Lane % Trucks	76	24	41.6	45.8	11.2	1.4
	Lane % Car	55.3	44.7	32.4	26.5	27.4	13.7
	% Total Traffic	60.6	39.4	33.7	29.6	25	11.7
Dataset Truck Percentages		24-34%; 29% avg		12%-19%; 16% avg				24%-34%		Maximum: 7%				17%		Maximum: 19%				Maximum: 12%
Speed	Posted Speed	60	60	60	60	60	60	65	65	65	65	65	65	55	55	55	55	55	55	55	55	55	55	55	55
	LOS C Speed
	Design-Hour Speed
Note: % Trucks = % MT + Bus + HT; % Car = % Auto + MC

Typical Truck Percentage1		4.30%
High Truck Percentage1		25%
1 Freight Facts and Figures, 2013. Pgs 17, 38. https://ops.fhwa.dot.gov/freight/freight_analysis/nat_freight_stats/docs/13factsfigures/pdfs/fff2013_highres.pdf

1 Freight Facts and Figures, 2013. Pgs 17, 38. https://ops.fhwa.dot.gov/freight/freight_analysis/nat_freight_stats/docs/13factsfigures/pdfs/fff2013_highres.pdf

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