New Approaches to Speed Management FLORIDA DEPARTMENT OF TRANSPORTATION September 9, 2022 DeWayne Carver, AICP DRIVER FRAMEWORKSMENTAL
Context Based Design 55-70mph 55-70mph 25-45mph 35-55mph 35-55mph 25-45mph 25-35mph 25-30mph Design Speed by context classification
DRAFT 2023 FDM • Revised SIS Minimum Design Speeds • Much better than PPM 45 or Less “Low Speed” • But… how do we get there?
Speed Management Strategies
Reducing Speeds Reduces Pedestrian Fatalities
Office Designof
60%50%40%30%20%10%0% C1 C2 C2T C3R C3C C4 C5 C6 MilesPortionInjuriesSeriousFatalitiesLane ZeroTarget Florida’s Safety Vision: Eliminate travel.forandrelatedtransportationall-fatalitiesseriousinjuriesallmodesof CONSIDERING CRASHES INVOLVING A PEDESTRIAN OR BICYCLIST OF FATAL AND SERIOUS INJURY CRASHES occuron OF SYSTEMTHE 80% 33%
6050403020100 C1 C2 C2T C3R C3C C4 C5 C6 SeriousFatalitiesInjuriesPortionofNetwork ZeroTarget Florida’s Safety Vision: Eliminate travel.forandrelatedtransportationall-fatalitiesseriousinjuriesallmodesof CONTEXT CLASSIFICATION GUIDE CONSIDERING ALL CRASHES
Using context classification to understand our safety problems
CONTEXT CLASSIFICATION GUIDE 76% of fatal and serious injury pedestrian and bicycle crashes occur in C3C or C4 Contexts
Target Speed The highest speed at which vehicles should operate on a thoroughfare in a specific context, consistent with the level of multi-modal activity generated by adjacent land uses, to provide both mobility for motor vehicles and a supportive environment for pedestrians, bicyclists, and public transit users. - FDM 202.2.1 and FDOT Speed Zoning Manual
TARGET SPEED • Target Speed = Speed Limit = Design Speed • Useful in context classifications with a wide range of acceptable design speeds • Design = Target Speed may have to occur incrementally over a series of roadway interventions and projects
FDM 202 Speed Management
FDM 202.2
Context Based Design 55-70mph 55-70mph 25-45mph 35-55mph 35-55mph 25-45mph 25-35mph 25-30mph Design Speed by context classification
Next steps… • Exceptional arguments require exceptional proof • Simulator testing • Review findings for possible changes to design criteria • What are the impacts on planning?