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Re: What Really Causes Traffic Congestion

Posted by RIPTA42HopeTunnel on Tue Jul 16 07:06:23 2013, in response to Re: What Really Causes Traffic Congestion, posted by merrick1 on Mon Jul 15 19:22:45 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.

Minimum clearance is 17 feet, and the structure would be between 2 and 5 feet depending on the material and structure design. The ramp would have to be at least 270 feet long.

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