SPEED awareness signs have been installed on a Penarth road to determine if there is a speeding problem.
The so called "driver messaging feedback" signs are now operating at two locations on Dinas Road.
The Vale council says the idea is to raise awareness of speed and get information on the overall speed of traffic.
The signs will remain in place for around three months and the data collected will be used to determine whether there is a big issue and whether enforcement action is needed.
They will be used alongside automatic traffic counts to give a wider picture of traffic numbers.
Cabinet Member for building services, highways and transportation, councillor Peter King said: "The council has deployed a pair of vehicle activated signs on Dinas Road in Penarth to improve highway safety, by reminding drivers of their responsibility of driving at a safe speed.
"The safety of road users and pedestrians is paramount and it is hoped that the above initiative will be successful to reassure the local community that the council is proactive in the education of speed enforcement in residential areas."
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