A campaign to get people to use the roads (5)
I believe the answer is:
drive
'a campaign' is the definition.
(drive can mean a campaign or initiative)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for drive that I've seen before include "Propel; outing" , "spin" , "zip" , "Diver (anag.)" , "tenacity" .)