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foot overhead clearance for their roadways. This allows for large trucks, farm vehicles carrying bales of hay, or gravel trucks with a tilted bed tailgating gravel onto a travel way.
What do you need? Emergency vehicles require a 12-foot clearance, but sixteen tons of gravel in a large dump truck, with a raised bed tailgating gravel onto your driveway, needs 23-24 foot of clearance. You could always request gravel deliveries using a smaller dump truck.
Here’s an interesting one to wrap . this up. It’s called “line of sight.” If your driveway has curves or big ups and downs, your line of sight in a vehicle is, in layman’s terms, the length of a straight line running from your eye to where you can see something approaching. If you have a lot of drivers in your family then you might encounter one another on a blind curve or at the crest of a hill that does not have a sufficient line of sight.
A more important application for “line of sight” is at your driveway’s entrance. You’d like a clear view up and down the highway before you enter it, especially if people are speeding by. Normally, a good line of sight is 100 feet for every 10-mph. If passing traffic is traveling at 55 mph, you need 550 feet of clear vision down the roadway: no trees, bushes, vines, walls, hillocks, signs, or buildings in the way. If the passing traffic is going 35 mph, you need 350 feet.
Line of sight problem elsewhere on your driveway? Drive more slowly. Next article: construction and maintenance of a driveway.
Don Audette
Sperryville
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