Before Your Trip
It makes sense to plan your route and research the roads that you will take on your travels. Make sure the maps you use are up to date and check the roads before you go. If you take the time to estimate your travel along your route, it will help if you have an idea of where you will be at certain points on your trip
This can help you have an idea of where you will be at certain points on your trip, helping you plan ahead to cover rest and meal stops. Also, it will prove invaluable on planning, to avoid travelling though a major city in the rush hour. Have your car checked, the filters, belt and oil and make sure your tyres are sound, checking the depth of tread. To make driving more pleasant and to give you more room, take out any items from the car that you know you will not need.
Have an emergency medical kit in the car, including tablets for motion sickness, plasters and headache tablets. Some countries also ask that if you wear lenses or glasses, that you always carry a spare pair.
This may just prevent a fine. Take all documents that you may need and make sure that you have your breakdown emergency number in your car. Also, keep your passport with you at all times, it could be needed for spot checks or identification purposes.