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U.S. Department of Transportation
Limitations of Current Systems
1.Current systems are limited by the data collected from
infrastructure-based sensors
2.Current systems do not collect and use (or
collect and use minimal) environmental data
3.Emissions data are not collected from vehicles
4.The majority of traffic signal systems are not optimized in “real-time”
5.Adaptive traffic signal systems require an
extensive amount of infrastructure-based sensors per approach
6.Current traffic signal systems are generally
optimized for mobility, not the environment
7.Current traffic signal priority applications do not consider
environmental impacts at the signalized intersection
8.Current traffic signal systems do not provide
information to drivers to support eco-driving
9.Electric vehicles are not capable of charging
their batteries as they wait at signalized intersections
Connected vehicle
technologies can help address these limitations