Motorists are being asked to be patient as resurfacing work on a number of roads in the Chichester area gets under way.
The annual works are part of a £3m project by West Sussex County Council and will affect more than 150 roads across the county over the next two months.
The programme has been increased to seal in repairs carried out following the severe winter weather and the county said the work would protect against future weather damage.
WSCC deputy leader Lionel Barnard, who has responsibility for highways and transport, said: “This is a very cost-effective way of protecting and prolonging the life of our roads.
“It’s quick and easy and traffic can be allowed to run on the new surface almost immediately, avoiding lengthy closures and disruption.
“Sealing the road in this way prevents water getting into the foundations and weakening the road, which can lead to potholes developing. Other benefits include an increase in skid resistance which helps improve road safety.”
The county council said where possible it would give advance notice of the works taking place, to ensure vehicles were not left out on the roads about to be treated.
Signs will also be put out advising drivers to travel slowly on recently-treated roads.
Cllr Barnard said: “It’s easy to think our roads are in poor condition at this time of year with the unfortunately inevitable crop of new potholes appearing.
“However, the Department for Transport tells us the roads in West Sussex remain among some of the best in the country.
“The surface dressing programme is an essential element of maintaining our roads in their present condition and we hope motorists will be patient while this work takes place.”
Surface dressing involves spraying a coating of bitumen on to the road, followed by one or more layers of hard stone chippings. Soon after a surface dressing is applied and the road swept to remove loose chippings.
The county council said advisory and warning signs would be in place and would not be removed from the site until the county council was satisfied it was safe to do so.