TRB Access Management AHB70

Increasing the awareness and use of Access Management

Before-and-After Safety Study of Roadways Where New Medians Have Been Added

Research Report: Florida Department of Transportation (FDOT)

The FDOT report documents the results of an investigation of the safety impact of median conversion from two-way left-turn lanes (TWLTL) to raised medians at 18 locations. The evaluation covers several median and roadway design features. The research includes a survey of business owners to gauge their reaction to the median conversion.

Overall, the results showed a 30.3 percent reduction in the total crash rate after median conversion.

Another main objective of this study was to document the experience of businesses on corridors that were recently converted from TWLTLs to raised medians and their involvement in the public information process. On-site interviews of businesses at 10 roadway segments were conducted and responses from 151 businesses were included in the analysis. The majority of the responding Businesses perverted TWLTLs to raised medians for better access and ease of truck deliveries. Two thirds of the responding businesses thought that raised medians were safer than TWLTLs. Of the 151 businesses, 40 indicated they were informed of public hearings  on the raised median construction projects. Of these, only 13 indicated they attended at least one public hearing.


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