The requirements for test driving a vehicle vary between dealerships. The best way to find out what the requirements are for any specific dealer is by calling to ask. There are some general things to keep in mind, however.
Often car dealers prefer to not offer test drives for their vehicles because doing so increases the risk of damage to the vehicle in an accident. Also, test driving adds additional mileage to the vehicle, which can translate into lesser value. According to Car and Driver magazine, being completely honest with the salesman is the best way to get that cherished test drive.