One of the side conversations that came about from MMM's disruption of the " Should I-11 be extended over and replace I-19?" thread yesterday pertained to Signed Highways with steep gradients (see pages 28-29):
https://www.aaroads.com/forum/index.php?action=post;quote=2791425;topic=30826.675
The two Signed Numbered Highways with the steepest signed grades I've encountered are both in California. CA 4 east of CA 207 approaching Pacific Grade Summit and Ebbetts Pass is signed with a 24% grade warning:
https://flic.kr/p/2jD2Ua7
Whereas CA 108 approaching Sonora Pass is signed with a 26% gradient warning:
https://flic.kr/p/2jD6nJP
Keeping this limited to Numbered Highways what other steep gradients are out there signed in field?
CA 36 does warn Trucks and RVs that Route 36 is not advisable for them west of I-5. Though not for a reason, but I assume it's got steep grades in excess of 7 percent that may be signed elsewhere along the aforementioned route.
Quote from: roadman65 on November 27, 2022, 08:29:57 PM
CA 36 does warn Trucks and RVs that Route 36 is not advisable for them west of I-5. Though not for a reason, but I assume it's got steep grades in excess of 7 percent that may be signed elsewhere along the aforementioned route.
Way more because of 100 plus miles of curbs and a segment which until recently was one lane.