The DRG application enabled familiar/informed drivers to receive real-time traffic information and choose routes with the least travel time. The SRG application provided familiar/informed drivers with turning decision information every five minutes and enabled them to choose routes with minimal accident risk.
Dynamic Route Guidance
- DRG activity generated additional accidents as a result of increased link maneuvers and intersection turns. The total number of accidents in the network increased as market penetration increased and a maximum 15.5 percent increase in accidents was observed at a market penetration of 60 percent.
- At a 20 percent market penetration rate total network accidents increased by four percent. At higher market penetration rates the number of intersection accidents dropped below baseline network levels. Overall, the SRG system reduced accidents by an average of 10 percent.
The author noted that reductions in travel time may reduce driver anxiety and offset the impact of increased accidents with increased DRG market penetration. Further examination of DRG and SRG benefits on actual transportation networks (not hypothetical) was recommended.