Pupils from more than 100 primary schools in Gloucestershire will be taking part in Walk to School Week, which begins on Monday. The aim is to avoid parents ferrying their children to school in cars.
The county council says it will cut congestion, encourage exercise and provide practical road safety training. Anthony Meehan, from the council, said: "Nearly one in five vehicles on the county's roads at the beginning and end of the day are on the school run."
He added: "This contributes to congestion, stress and impacts on everyone's quality of life."
Participating pupils can claim stickers and bookmarks if they walk or cycle for part of their journey and will each receive a certificate.