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Maximum Slope for Heavy-Duty Vehicle Parking Lot

Maximum Slope for Heavy-Duty Vehicle Parking Lot

Maximum Slope for Heavy-Duty Vehicle Parking Lot


What is the maximum grade/gradient allowed for non-temporary (overnight or longer) parking/vehicle storage areas in parking lots for heavy-duty vehicles such as semi-trucks and buses?

All I could find is that the International Building Code allows a maximum gradient of 1:15 (6 2/3% grade) in any direction for parking spots, that the Americans with Disabilities Act allows 1:20 (5%) running/longitudinal maximum for accessible areas that do not count as ramps, and that the ADA allows a maximum of 1:48 (2.0833%), with 1:50 (2%) preferred maximum, in any direction for disabled parking spots.

On a related note, I could also find that the Federal Aviation Administration limits the runway to 1.5% longitudinal maximum for aircraft approach categories C, D, and E (all jet airliners (heavy-duty if such a classification existed) fall within this), that the FAA limits it to 0.8% maximum longitudinal for the first and last quarters of the runway for the same categories, and that the FAA limits airport aprons (parking areas) to 1% maximum in any direction for the same categories.

Similarly, I could find that most mainline railroads (more accurately railways) and metros limit it to 0.5%-1% maximum at station platforms, most mainlines 0.1%-0.25% maximum in parking and coupling/decoupling areas, most metros 0.15%-0.5% maximum in parking and coupling/decoupling areas, most light rails 1%-2% at station platforms, and most light rails 0.3%-0.5% in parking and coupling/decoupling areas.

So, is there any legal, industry, or trade association standard that sets a maximum slope for truck and bus long-term parking/vehicle storage areas, especially to prevent rollaways in case of brake failures? Here, I am not referring to loading docks, where there is a structure to rest against.

RE: Maximum Slope for Heavy-Duty Vehicle Parking Lot

Kwan Kok Ko, posting the same question in different forums is discouraged if not prohibited in Eng Tips.

Rather than having two threads on the same topic, responses should be posted here: https://www.eng-tips.com/viewthread.cfm?qid=491350

My glass has a v/c ratio of 0.5

Maybe the tyranny of Murphy is the penalty for hubris. - http://xkcd.com/319/

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