A trail of signs that show the real-time price of fuel is to start on the M5 between Bristol and Exeter next week.
The electronic signs are due to go live the southbound route on March 29 and the aim is to help drivers choose where to fill up. Five service stations along the route will be taking part.
Roads Minister Andrew Jones said: “The government is on the side of the motorist. We know the public has been concerned about the price of petrol at service stations which is why we have acted to create a fairer deal.
“This trial will allow drivers to be much better informed about the cost of fuel and make it easier to plan their breaks around the cheapest deals.”
Highways England South West regional director Andrew Page-Dove said: “This trial is an important part of a bigger picture – we want road users to be more informed and in better control of their journeys. This means they’ll be better prepared, more inclined to plan breaks, have sufficient fuel and have a more positive driving experience.”
During the trial, which runs to the end of 2017, Highways England will monitor driver behaviour and see the impact on stops at which service areas, fuel pricing and fatigue and fuel related incidents.
The funding for this was announced in the 2016 Budget.