Pulling I-40
A friend of mine was telling me that driving East on I-40 into Flagstaff is a long and steep drive. That I will be down to 35 mph at times. I was also told the same about Grants Pass in I-5 going into...
Forum Discussion
guardrail53 wrote:
Because it's a interstate it's limited to 6% ?????????? Totally Wrong!! Better start reading the signs! Many 7, 8% grades in the U.S.
Standards for Interstate Highways in the United States as defined by the American Association of State Highway and Transportation Officials (AASHTO):
Maximum grade: Maximum grade is determined by a design table based on terrain and design speeds, with up to 6% generally allowed in mountainous areas and hilly urban areas with exceptions for up to 7% grades on mountainous roads with speed limits below 60 mph (95 km/h).
While there may be exceptions, those are rare....Dennis
