When signals were first considered, there was fear that standard threelens signals (i.e., red, amber, and green lenses) might be problematic on approach legs....
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SIGNALIZATION OF ROUNDABOUTS
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Appendix A: Pedestrians with Visual Impairments
The most common vision measure, known as visual acuity, ranges from the standard of 20/20 (normal vision) to complete blindness (no light perception)....