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Re: What Really Causes Traffic Congestion

Posted by merrick1 on Mon Jul 15 19:22:45 2013, in response to Re: What Really Causes Traffic Congestion, posted by 3-9 on Mon Jul 15 00:54:11 2013.

Lets say that the overpass needs 13 feet of clearance (which is the clearance of the Lincoln Tunnel) Add 6 inches for structure under the walkway. The ADA allows a ramp to have a 1/12 slope. So we need 162 feet of ramp. The maximum rise between landings is 30 inches and the landings have to be 5 feet long. So we need 5 landings. That brings us to 187 feet. A typical block is ~250 feet. The ramp would be 3/4 of a block long.


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