Lesson

Avoid using blank messages on dynamic message signs (DMS) including dashes for travel time applications as drivers may not understand these signs or assume they are broken.

Findings from focus groups that evaluate the usefulness of hybrid static-dynamic signs in Florida.


December 2012
Statewide; Florida; United States


Background (Show)

Lesson Learned

Avoid using blank messages including dashes for travel time applications as drivers may not understand these signs or assume they are broken. For applications that provide comparative travel times, a majority of participants preferred a display that provided both travel times and toll amounts on one sign.

Beware that deploying hybrid static-dynamic signs for traveler information is useful to drivers, but may encourage speeding.
  • Countdown signs have potential to encourage speeding as drivers attempt to beat the time on the sign.
  • Participants are more likely to slow down when automated speed control messages display their would-be fine instead of their speed.
  • Participants indicated that with advisory speed progression applications it can sometimes be difficult to differentiate between the advisory speed sign and the posted speed limit sign.


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Source

Best Practices in the Use of Hybrid Static-Dynamic Signs

Author: Gan, Albert ; Dibakar Saha; Kirolos Haleem; Priyanka Alluri; and Dennis McCarthy

Published By: Lehman Center for Transportation Research, Florida International University

Source Date: December 2012

URL: http://www.dot.state.fl.us/research-center/Completed_Proj/Summary_TE/FDOT-BDK80-977-15-rpt.pdf

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Lesson ID: 2015-00721