ITE Journal - March 2021 - 35

Brilliant Maps/Transport for London

Doubled-up signs on the left and right side of the road provide
additional opportunity to be seen. Reflective strips on signposts
provide more color and help " tie the sign to the ground " visually. And
flashers-including beacons above the signs and LED lights around
the edge-add another element that can make the sign stand out. 

DKS Associates

Minnesota DOT

Figure 9. Left: Normal-vision map. Center: Simulated colorblind-vision
map. Right: Double-coded map to aid colorblind users.

Figure 11. Stop sign with LED enhancement.

Figure 10. Guide for optimizing maps for colorblind viewers.
Run by Colorblind Folk to Identify Other Issues You've
Missed. Colorblind people are often willing to share their
experiences to help make their products and experiences more
accessible. Be sure to note, however, that color vision deficiency
varies widely by type and degree, so something one colorblind
person can see clearly could still be problematic for someone else.

Striping Solutions. In many European countries, white
pavement marking is used for all routine lane markings. For
example, in Germany engineers use patterns instead of colors to
communicate with motorists.4

Colorblind-Friendly Solutions
Designing and operating for colorblind users starts with awareness.
On the roadway, designers and traffic engineers have several tools in
the toolbox to aid colorblind travelers. One key element of colorblind
accessibility is that helping color vision deficient users also helps
everyone else navigate the system safer and more efficiently.
Signing Solutions. It is common for some signs to blend into the
natural environment, especially in late summer and early autumn
as leaves change to colors that match the red, yellow, and brown
signs. Fortunately, signs can be enhanced to stand out against their
background.

Figure 12. German pavement marking patterns.
1.	 No passing in one direction. You may pass only if you have
a broken line on your side; you may not cross a solid line on
your side to pass.
2.	 No passing. You may not cross the solid center line to pass.
3.	 Lane separation line. Short broken lines between opposing
traffic lanes indicate that the passing zone is ending.
4.	 Lane separation line. Long broken lines between opposing
traffic lanes indicate passing is allowed (unless prohibited
by a sign). This marking is also used to separate traffic lanes
traveling in the same direction.
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M a rch 2021

35


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ITE Journal - March 2021

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