185 km / 115 miles – 3 to 4 hours – California, USA
This route follows the famous Angeles Crest Highway to the Red Box junction. From there you go to the Mount Wilson Observatory, which is worth the extra time.
Take the same way back to Red Box junction and go right to follow the lovely twisty roads (#138) towards the Barstow Freeway. Go over the freeway to keep following road 138 untill it turns into road 18. Finish the route in San Bernardino.
La Cañada Flintridge – Mount Wilson Observatory – Wrightwood – San Bernardino