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Appendix B. Visual Presentationof Interchange Examples

Publication Number: FHWA-HRT-14-069 Date: October 2014

Publication Number: FHWA-HRT-14-069
Date: October 2014

Collecting and Analyzing Stakeholder Feedback for Signing At Complex Interchanges

APPENDIX B. VISUAL PRESENTATION OF INTERCHANGE EXAMPLES

These examples of complex interchanges were presented to participants during some of the interviews.

This photo shows vehicles on a highway. Five signs hang above the highway. The signs are placed very closely together and have so many directions, destination names, and arrows on them that a driver is liable to become confused.
Figure 8. Photo. Example of information overload on a sign structure.

The photo shows an exit ramp off of a highway. Two signs hanging above the road span both the highway and the exit ramp. One sign has three directional arrows pointing to the highway, and one sign has two directional arrows pointing to the exit ramp.
©Battelle
Figure 9. Photo. Example of confusing destination grouping caused by
perceptual cues from sign elements.

The photo shows vehicles on a highway with a right-hand exit ramp. Three signs with directional arrows and destination names hang above the highway. The signs are not directly hanging over the lanes that their arrows are meant to point to.
Figure 10. Photo. Example of skewed visual perspective causing difficulty in
matching arrows to lanes.

The photo shows vehicles on a highway that is about to curve slightly to the right. Hanging from a bridge above the highway are two signs, with a destination name and a curved arrow pointing left, and one with a destination name and a curved arrow pointing right. Neither sign is pointing to an exit ramp off of the highway.
©Battelle
Figure 11. Photo. Example of mismatch between direction of arrows on signs
and perceived roadway direction.

This photo shows a highway with a right-hand exit ramp a small distance away and direction signs hanging above. The ramp appears to dip and bend as it leaves the highway, and at that spot where the photo has been taken, the arrows on the direction signs appear not to match their lane assignments.
©Battelle
Figure 12. Photo. Example of skewed roadway perspective and
difficult arrow alignment.

This photo shows vehicles on a highway with a right-hand exit ramp and a direction sign hanging above. There are red arrows going from the arrows on the signs to their respective lane assignments, showing how the arrows appear to not align correctly with their lanes.
Figure 13. Photo. Example of perceived misalignment between
down arrows and lanes.

This photo shows vehicles on a highway and direction signs hanging above. The sign has two destination names and a single lane illustration that branches off into two lanes with directional arrow heads.
©Battelle
Figure 14. Photo. Example of difficult-to-see lane lines on a diagrammatic sign.

This photo shows vehicles on a highway. The right lane of the highway branches off into a separate lane (separated from the highway by a concrete median) that has its own right-hand exit ramp. A direction sign hangs above the highway and illustrates both the beginning of the separate lane and the exit ramps off of that lane.
Figure 15. Photo. Example signing for a mixed system-service interchange.

Page Owner: Office of Research, Development, and Technology, Office of Safety, RDT

Topics: research, safety
Keywords: research, safety, Complex Interchanges, Interchanges, Signage, Driver Behavior
TRT Terms: research, Safety and security, Safety, Transportation safety
Scheduled Update: Archive - No Update needed

This page last modified on 01/31/2017