1. Before And After Analysis of
Two-Way Left-Turn
Lane and Driveway
Consolidation Access
Management Project
Along South Duff Ave.
In Ames, Iowa
Completed Fall 1994
After: 17 crashes/year
70 percent crash rate reduction
Rear end crashes reduced most
Before: 50 crashes/year

2. Driveway-Related Crashes Des Moines, Iowa Metropolitan
Ankeny, Iowa Detail
Ankeny Blvd.: Recently Completed Raised Median and Driveway Consolidation Project In Commercial District
1st Avenue: Mainly Four-Lane Undivided
With Substantial Retail Development--
Potential for Better Access Management
Driveway-Related Crashes Des Moines, Iowa Metropolitan
Area, 1996 Data