Does Lewisville really need red-light cameras when I have heard that all that is really needed is an extension of the yellow-light timing?
A. This question was answered directly by a field study conducted by the Insurance Institute for Highway Safety (IIHS). Six intersections were tested sequentially, starting with an increase in the length of the yellow light. The results produced an impressive 20-63 percent reduction in red-light running. However, when cameras were installed at the same intersections, a further 87-100 percent reduction in red-light running was recorded. The worst intersection for violations before the test showed 251 violations per 10,000 vehicles passing through. That dropped to 198 violations per 10,000 with an extended yellow light, but dropped to 2 violations per 10,000 vehicles once cameras were installed.
