The sign "Camper and caravan site" indicates a designated area where campers and caravans are permitted to park or stay overnight. This sign is typically placed at the entrance of such sites to inform drivers that facilities and services for campers and caravan users are available. These sites often provide amenities such as water supplies, electricity, waste disposal, and sometimes even recreational facilities.

When you see this sign, you can expect a place that is suitable for setting up a camper or caravan, making it a convenient option for those traveling with these types of vehicles. Be sure to follow any specific rules or regulations that may apply to parking or staying at these sites.

If you have any more questions about traffic signs or rules, feel free to ask!