of design modifications that can reduce average speeds in a limited area. These can include roadway markings that serve to make the street appear narrower or to supplement roadside speed limit signs with that information painted on the roadway. For instance, road humps-wider and not as abrupt as speed bumps-work for some residential streets.
Studies have found that a one-mile-per-hour decrease in the average speed on a given stretch of roadway results in a crash rate reduction of about five percent. Making carefully planned speed management part of our safety belt and DWI programs can have a significant impact on crash death and injury rates. ■