On the barge the three tracks are spread to allow clearance for the freight cars.
Then subtract an eighth of an inch from each measurement to allow clearance.
"With time," he said, "the body's natural processes will eventually allow breakdown and clearance of the gel."
In 1977, the bridge was modified to allow higher clearance under the center span.
They must also be at least ten feet away from any building or structure overhang to allow overhead clearance.
The top chord has been disassembled to allow clearance of some bridges it must pass under.
At its center, the bridge has a 52 foot rise allowing clearance for vessels passing beneath the structure.
There are channels cut into the lake that allow clearance for boats.
The handle is offset to allow clearance for fingers.
Logging trucks own the road and have to be watched for and allowed clearance.