access road; access route
General term for a road or route that provides entry to a facility, area, or main road.
An access road to the new factory has been built.
entrance ramp; on-ramp; slip road
Specifically the ramp or slip road used to enter a highway or expressway.
approach path
Aviation term for the flight path an aircraft follows when approaching a runway for landing.
There is a traffic jam on the highway entrance ramp.
The pilot confirmed the approach path and prepared for landing.
進入禁止 means 'no entry', often seen on signs, contrasting with the entry path itself.
Compound of 進入 (entry, penetration) and 路 (road, path). The exact historical derivation is uncertain, but the components transparently combine to mean 'entry road'.