He said: “The more accurate and detailed our travel data is, the better we can be at planning future transport improvements in the city.
“These sensors don’t just capture more information, they are also much easier and less disruptive to install and cheaper to maintain.”
Stephens added the sensors would not be “collecting any data to identify individual road users or their vehicles”.
The sensors will be initially installed on Alma Road, Bretonside, Exeter Street, Laira Bridge Road, two on Plymouth Road, St Budeaux Bypass and at Western Approach.
PCC said work was expected to take place mid to late-January and said some short lane closures could be needed for safety reasons while sensors were fitted.