I also have a problem with not realizing a cop is sitting in a speed trap up ahead until it's almost too late.
Again, experience is the key.
Watch out when there is a straight section that is downhill.
Watch out even more if there is a break in the median at the bottom of the hill or if there is a pervceived gap between the tall trees.
Watch out for any signs of tire marks on the median or on shoulder grass other than obvious accidents.
If you are taking the same road back, keep an eye on both directions on the first leg and know where the speed traps are to prepare for your return leg.
Keep an eye on helpful oncoming traffic who might flash you.
See if the ricer that overtook you at 90mph 30 seconds ago is staying with the pack 1/4 miles ahead of you.
Also, keep an eye on cars 10 to 15 seconds ahead of you and see if they brake at inappropriate places (going uphill, coming out of a turn, etc.)
Wait for someone to overtake you if you happen to be on the open road, then set the cruise so it is about 2mph slower than the car that overtook you.
However, the best option is to stay near the speed limit. In my area, exceeding 15mph above speed limit on highways and most roads seem to be the threshold. Therefore, I will usually hover around 10mph above the posted limit.
I drive an Element as you know, so I don't really drive that fast anymore (though at one stage, I was two points away from getting my license suspended), but it is amazing how some little-peckered assholes have to overtake me and gets pissed off when my E, set on cruise control, overtakes them. I came across a Chinaman in an X3 who had to overtake me everytime my E was half a carlength ahead of his. I had my cruise set at tad under 80mph while this idiot had to go at least 90mph to zoom past me and 2 minutes later, he found himself behind me only to repeat the process. I retrospect, that must have been NewMBie.