Do you mean a hotel near the autoroute? If so, then on almost all the autoroute junctions, near major towns, you'll find many budget hotels on the route into town, or well-signposted nearby. The website http://www.eurapart.com/budget.html has links to many of the budget chains, and you can look for hotels in the areas you're thinking of.
We've stayed in many of them - and there are also many other family run hotels in french towns - some very cheap indeed.