One's brain is better than a radar/laser detector. Just pay attention. Look for brake lights in the distance (everyone brakes when the see a cop). Look for clumps of cars (tend to build up around cop cars). Looks for spots cops would hide on straightaways and long highway turns. Follow other speeders at a good distance. It's pretty damn easy to speed responsibly and not get a ticket. Been doing it for almost 20 years without a detector and no tickets. I give a thumb up when I pass cops running speed traps.
'11.5 M3 sedan | Jerez Black Metallic | 6MT | M Performance Exhaust | no DCT no EDC no NAV no nonsense