Is there specific legislation that allows Cops to sit on the side of an Interstate Hwy to check for speeders.?

No, that is not entrapment. Entrapment is when a police officer puts pressure on you to commit a crime you would not have committed without the pressure.

Interstate Highways are funded by the federal government, but they are governed by the local jurisdiction. The authority to patrol them would be in your state traffic code, and in the state statutes that grant law enforcement authority. I could certainly give you the references for my state, but there will also be 49 other correct answers depending on where you live.

Underage stings, likewise, are allowed when under the direct supervision of a law enforcement officers. I have a link for that too, if you live in the same state I do. Again, they are not entrapment because there is no pressure put on the sales person. They are required ask for ID.

In my state, and exemption is granted for parking on the shoulder as long as the vehicle is giving a visual signal. This applies not only to police, but all emergency vehicles including fire, medical, and even tow trucks. Again, this exemption is granted by state law, so you will have 50 different references. As far as parking in the median or crossover, that exemption is posted under the NO U TURN sign.

Can you show me the law which states its illegal to pullover on the shoulder of the interstate? There is no such law. Yes you're vehicle will get towed if you abandon it on the interstate but there is no law about stopping on the shoulder.

Municipal workers are allowed to leave the roadway while performing official duties. This would include law enforcement working traffic. By your logic an officer could write a ticket to a snow plow for driving on the shoulder or construction workers for walking in the ditch.

And it is not intrapment for the police to set up stings. There are very certain rules to follow, but as long as the rules are followed the informants can't be charged.

Maybe you should simply try not speeding and keep your eyes on the road.

No, it's nothing remotely like entrapment. Look it up.

And the are no federal laws about driving or parking (except on federal premises like military bases, VA medical centers, and the like.)

I have not been affected quickly, yet in a roundabout way, my dogs is a Staffordshire Bull Terrier, and thanks to media hype round "Pit Bulls", human beings seem at my dogs otherwise, like he's risky, yet that's the smaller (majority of the time that's Shih Tzus and Fox Terriers) are those which have shown aggression in the direction of me and my dogs. My neighbour and that i have been given into an argument because i became playing fetch on the line with my dogs (it became a quiet street, very few vehicles), she advised me to "save my dogs on a leash because he's risky". some all of us is so mis-guided.

You got a ticket and want to whine about it. Pitiful.

There is nothing illegal about it anywhere. Pay the damn ticket and stop being a baby. Oh yeah, slow down before you kill someone.

You need to look up the description of 'entrapment'.... you obviously don't know what it is.

there's no specific law or legislation, it's called law enforcement.

BRUCE nailed the answer-no need to add anything to it