There are actually 2 connections from the parking lot to the main road here. The further one has a sidewalk that connects to the one on the main road near the ramp up to the overpass. The nearer connecting road is missing from the map.

via StreetComplete 62.2

Attached photo(s):
https://streetcomplete.app/p/337843.jpg
https://streetcomplete.app/p/337844.jpg