Driving Roads / Mulholland Drive
This 21-mile ridgeline road follows the crest of the Santa Monica Mountains and Hollywood Hills, lined with overlooks of the Los Angeles basin and the San Fernando Valley. About 8 miles west of the 405 are dirt and closed to cars. It runs about 21 miles along Mulholland Drive in California. Drive time: about 35 minutes (paved Hollywood section).
Best time to go: Year round; storm damage and mudslides can close sections, so check road status before you go.

Sources: Length · Best time. Drive time is the route time for the mapped route without stops, from Mapbox.
A cruise-and-view road: record your run between overlooks and the ridgeline joins your map of every road you have driven.
It is a residential, heavily used road with blind curves; keep speeds modest, watch for pedestrians at overlooks, and never street race.
Open Road keeps every drive: the route on a map, the time and the distance. On iPhone and Android.