Crest had a built-in speed limiting "design": potholes. They were so bad that no one could speed.
Two of the people on the design team spoke to me that they did not want the city design and got what they wanted in the current design. The new design has a built-in speed limiting rises that firetrucks can negotiate. It's good they took out the center obstruction as many motorists did not know how to negotiate this, and large SUVs couldn't go around it or over it. 
I walk on its sidewalks regularly. It's very calm.