Richard A. Retting

TL;DR: A critical review and assessment showed that modification of the built environment can substantially reduce the risk of pedestrian-vehicle crashes.

TL;DR: A before-after study was conducted using the empirical Bayes procedure, which accounts for regression to the mean and traffic volume changes that usually accompany conversion of intersections to roundabouts and suggests that roundabout installation should be strongly promoted as an effective safety treatment for intersections.

TL;DR: Overall results indicated significant reductions for all injury crashes combined as well as for frontal and opposing-direction sideswipe injury crashes--the primary target of centerline rumble strips--in light of their effectiveness and relatively low installation costs.

TL;DR: Examining the prevalence of red light running crashes on a national basis and identifying the characteristics of such crashes and the drivers involved finds red light runners were more likely than other drivers to be younger than age 30, male, have prior moving violations and convictions for driving while intoxicated, have invalid driver's licenses, and have consumed alcohol prior to the crash.

TL;DR: Overall, the red light violation rate was reduced approximately 42% several months after the enforcement program began and increases in driver compliance with red lights were not limited to the camera-equipped intersections but spilled over to nonequipped intersections as well.