Narrow ramps for vehicles

Space is always limited. And the ramps for cars are wide. This is, of course, great when you have heavy traffic and cars need to pass on these ramps. But what if only one or two cars go there once a year? Six spaces for a ramp already seems like too much. How much does a car need to fit through there, two spaces? Well, give us a ramp four spaces wide in total :) And another narrow and long one! That would be fantastic.