The phrase "mph zone" refers to an area where the speed limit is measured in miles per hour (mph). It signifies the maximum speed that is allowed in a particular region. Full definition
He said he never pulls anyone over in that 25 mph zone unless they're going more than 40 and he NEVER tickets anyone from the hospital. (religion.blogs.cnn.com)
I got a speeding ticket going 82 mph in a 35 mph zone what kinda of ticket is this consider I was driving alone and traffic was light. (myimprov.com)
In the video, which has garnered tens of thousands of views on YouTube, Berky becomes increasingly distraught after she's pulled over for driving 43 mph in a 30 mph zone on Ulster Avenue. (hudsonvalleyone.com)