Owners of campervans in France often wonder whether they can use areas reserved for motorhomes. The key criterion is self-containment: having a shower, toilet and waste-water system is often a requirement. Legally, these areas have no special status in traffic rules and are treated as ordinary parking lots, so there is no ban on entry, but managers may set restrictions.
However, setting up camp on these areas is prohibited. Thus, access is allowed for short-term parking only, not for overnight camping.