When you drive hire cars in Bristol, you will drive on the left-hand side of the road. Speed limits differ in some urban areas, at 20 mph (30 kph) or 30 mph (45 kph). While on motorways, the speed limit is 70 mph (110 kph). It's compulsory for everyone in the car to wear a seatbelt while the car is moving. If you are travelling with children under 12 in your Bristol car hire, they cannot sit in the front seat. All children under 135 cm tall will need to use a child seat. Only babies, secured in a baby car seat, may sit in the front seat as long as the car seat is rear-facing. Bristol's drinking and driving rules state that you cannot have more than 80 mg of alcohol per 100ml of blood. Before you drive your hire car in Bristol, you should contact the city's motor vehicle department to check for any recent law changes.