If you are new to RVing, or if you are new to driving large vehicles, there are several factors to keep in mind. Things that might not seem to be an issue when you are driving a car, or even a van or truck, make a difference when you are behind the wheel of a motorhome. Of course, there’s the RV’s length, braking distance, turning radius, and blind spots. However, besides all that is also the RV’s height. The height of the RV, along with any rooftop accessories such as air conditioners, can make a difference in whether it can clear the underpass beneath a bridge, canopy, or overhang.
Your RV's Height
First thing first is to be aware if the exact height of your RV, measuring from the rooftop to the ground. Remember to measure the highest point of any roof vent, air conditioner, satellite, or other rooftop features, and add that to the total. While the owner’s manual will state how tall your RV is, it is always best to physically measure the total height yourself. The average maximum height of an RV is between 13-14 feet, but you cannot assume that is how tall your motorhome is. Once you know the total height and are sure that it is accurate, post it somewhere near the dashboard so it can easily be seen while driving. You do not want to have to quickly recall your RV’s height while approaching a bridge.
Tips on Bridge Clearances
Most bridge clearances average around 14-16 feet, but that does not tell the whole picture. While most bridges have a sign indicating the height, they are not always up to date. A couple inches in height can be lost due to repaving the road, and the sign may not have been replaced to show the new information. Remember that is the average height, so bridges can also fall outside this range. Older bridges or specially designed bridges may be lower, as well as bridges along state or local roads that do not have to follow federal standards. A good rule of thumb is to subtract about 6 inches from the indicated height to account for any repaving that may have occurred. If you choose to drive under a low bridge, drive slowly to prevent bumps in the road from causing your RV to hit something. If you are using a GPS, make sure it is one designed for RV travel. A standard GPS or the app in your phone will not account for RV-specific hazards such as low bridges. Do not rely fully on an RV GPS, however, as even they are not foolproof. They need to stay updated to have the most accuracy.
As mentioned at the beginning, height clearance pertains to more than just bridges. There are also gas station canopies, rest stop overhangs, tree branches, and power lines. If it is safe to do so, pull over to the side of the road to get out and look if the clearance looks a little too close. Remember a GPS is not going to warn you of canopies or power lines. Truck stop gas stations are usually safe when it comes to getting fuel. Otherwise, it is best to choose an outside pump and try to position your RV so it does not pass under the roof. If trucks are barred from passing due to their height, chances are your RV will not make it either. If it looks like the RV will not clear the height, either back up or turn around if it is safe to do so. If it is not safe to turn around, you can alert the local police for help so they can direct traffic. If you hear a noise like the roof of the RV has hit something, stop. Do not immediately try to back out without making sure it is safe to do so.
