I can't tell you about the detector, but I'll tell you to be reaaaaal careful in Jefforson County on the interstates. Actually... Any interstate within 30 miles of downtown B'ham. Popo's will bitch slap you hard and fast.
You'll fucking love the new interstate I-65, north of town, on to I-20/59 to Tuscaloosa. It's all brand new, Including Malfunction Junction!!! (Second time a flammable truck has crashed and destroyed aprt of it in the last 3 years and

to as fast as you wanna drive! The new 3 lane highway is pretty wild. It's definatly wild if you wanna test your car's handling @ 130mph.+
Just be real careful. Damned Popo's... Save the speeding till you get past Tuscaloosa.