noun
access road; access route
General term for a road or route that provides entry to a facility, area, or main road.
新しい工場への進入路が整備された。
An access road to the new factory has been built.
noun
entrance ramp; on-ramp; slip road
Specifically the ramp or slip road used to enter a highway or expressway.
高速道路の進入路で渋滞が発生している。
There is a traffic jam on the highway entrance ramp.
noun
approach path
Aviation term for the flight path an aircraft follows when approaching a runway for landing.
パイロットは進入路を確認して着陸態勢に入った。
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'.