Escape ramps are ramps that can be used:

Question

Escape ramps are constructed in areas with steep downgrades to allow a means of safely stopping runaway vehicles. They consist of a long bed of loose, soft material, and sometimes an uphill slope.

Accepted Answer

To stop runaway vehicles on steep downhills.

Answer

Only by automobiles, not trucks.

Answer

To leave the highway and enter a two-lane highway.