It is actually betterthan you think
If you have a camper van or a tent you can pitch on tarmac. You can often park overnight at many resturants that have car parks. the routiers are especially good as they also have showers as well as naturally, food.
Somewhere there is a list, think there is a campervan club which has a book of most of teh venues, but there are thousands.
The idea is you will have a meal and depart in the morning before the lunchtime traffic.
Also in France, land of the campervan, most rest areas on the major roads have overnight facilities for vans and if you are sensible, bikes with tents.