I am trying to design a box culvert cover to be traffic rated and heelproof. For the heelproof, I have found that a gap of 1/4" or less will meet the local standards. The "traffic rated" part has me concerned. I have looked at many manufacturers of grating and all will supply me a grate that is H-20 rated. When I ask (out of my own curiosity) what the actual loading is for H-20 in psi or load over area, they all say that it is based on a 32k axle. This does not tell me what the actual loading is. Is there a call out for the loading of one tire? What is the size of that tire in contact with the grate? I have searched the internet and have found nothing stating the tire size and tire load.
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