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Maximum Slope of Truck Parking Lot

Maximum Slope of Truck Parking Lot

Maximum Slope of Truck Parking Lot

(OP)
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?

RE: Maximum Slope of Truck Parking Lot

Are you looking for grading for a loading dock? or just drainage of the surface? For the former see:

https://www.novalocks.com/wp-content/uploads/Dock-...

for the latter, I usually use a maximum of 1.5% slope to drains. It generally prevents water/ice buildup. pipe

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

RE: Maximum Slope of Truck Parking Lot

(OP)

Quote (dik)

Are you looking for grading for a loading dock? or just drainage of the surface? For the former see:

https://www.novalocks.com/wp-content/uploads/Dock-...

for the latter, I usually use a maximum of 1.5% slope to drains. It generally prevents water/ice buildup.

I'm not looking for a loading dock, which is why I said long-term parking specifically. I am referring to yards/parking structures (where there is no dock to act as a stopper) where fleet vehicles are stored or truck stop overnight parking spots.

RE: Maximum Slope of Truck Parking Lot

I'm not aware of a standard, but I've usedd 1.5% as a 'standard'. It's shallow enough not to cause problems and steep enough to permit water to run-off.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

RE: Maximum Slope of Truck Parking Lot

I've seen requirements that vehicles >10kips have to chock the wheels when parked. These were mainly owner requirements that I think are rooted in the EM-385 safety manual.
I have asked this question before for passenger vehicles but found no regulation or industry standard; it's a best practice/common sense kind of thing. I was told that at >4% the vehicle doors will fly open or slam shut which then affects stall width to protect adjacent vehicles.
Since you asked I'll assume there are no prescriptive specs governing such on this project, but I have seen that.
Since you asked I'll assume that 1.5% is not attainable without spending a lot of money.
It's kind of a tough spot, because you're not necessarily in the wrong, but every person that goes to park will wonder who designed this.


RE: Maximum Slope of Truck Parking Lot

I think the parking area/lot is always based on drainage concerns. If too steep, stoppers or blocks should be provided.

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