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Originally Posted by doviatt
I completely agree with you first paragraph and would add- remember it is a maximum speed limit legally but safety judgment is in your own hands.
But your second I cant quite agree with. Water is an incompressible medium all of the molecules have to, by natures law, go the same speed. Traffic is more like air. Air wants naturally to be a certain distance from the next molecule. Pressure will reduce this distance. Traffic behaves the same way as air. When stopped at a jam- Bumper to bumper- high pressure. The distance between does increase with speed. On and off ramps, and curves cause turbulence and pressure differentials.
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If you increase the number of molecules without increasing the speed through the hose you will get a pressure increase, if you put a restriction in the hose it will slow the flow and the pressure will increase and as you alluded to with cars this will cause them to do things like slow down, bounce off each other, and otherwise disrupt the cars coming from upstream. By reducing the restrictions to the flow of molecules you get a reduction in pressure the result is higher velocity through the hose.