In PA it's law that it has to be 10 mph over the limit unless clocked with a gun. I was surprised at that, I didn't know it, then one day the news is doing a report on the fuzz picking up speeders on local highways and heavily traveled side roads through townships and boroughs the state doesn't watch but local do.
In PA local police can't use radar guns, only state, but they're trying to change it so city police in the state's major cities can use radar... Anyway, in the news report they looked into the law and if you're 10 mph over, they can clock you with the watch but anything under that isn't allowed unless clocked with the Radar gun.
Funny story... for me anyway.
I live out an artery into the city called PA Route 28. It's just a freeway into Pittsburgh and I live actually 20 minutes away from the freeway but it's my main artery into the city. Anyhow, I used it to commute to school so I was cruising down one day... I do about 70 or 65 though it's a 55 zone. This is average though it seems and I keep pace with traffic packs...
The highway follows the Allegheny River down into the city fairly closely, and down near an Industrial park the highway dips down and you can see a straight stretch of the river pretty clearly, then you go up a hill on the highway and at the crest is the industrial park's exit. So I'm rolling down into that valley and I see a little Cesna airplane cruising low along the river which is really odd. It was definitely a low flying plane following the river down the center... So I begin up the hill but I can see the plane still following the river... As I get tot he top of the hill I see the plane bank fairly hard to the right and come perfectly perpendicular to the highway and begin crossing it just as I'm cresting...
I thought the plane was strange when I first saw it, then I knew something was up so I let off the gas quickly, and the pack I was in was gone. We'd been doing 70 going up the hill, and many were passing in the 3rd lane on the hill to get to the frnot of the pack... I was now several carlengths behind the pack and just as we crested the hill the plane had passed overhead across us...
Low and behold, he was a cop clocking people... Other side of the exit ramp (on the on ramp) were 8 State Police cars... They nailed everyone in the pack but me.
Good times.
