The only way youve a chance of picking up the lazer detectors (either on the tripod or in the safety vans) is with a lazer detector. The B2 and road angel both have this capability and are both similar performers when it comes to laser detection acording to
http://www.ukspeedtraps.co.uk/frames.htmhttp://www.ukspeedtraps.co.uk/frames.htm
However the B2 is the better overall performer according to most posts on here.
If the laser beam isnt been targeted at your car, or a car near you, you wont pick up the wider defracted lazer signal, hence no alarm, no matter what you are using Adams. Its basically 50/50 with the vans when using a detector, as they can usually take a reading before you can react to the alarm and brake. The current best you can buy is the B2 IMO.
If you want to guarantee not being done by the vans etc, then buy a lazer jammer (sends out a signal to confuse the spead trap machne when you are being targeted). I believe these are ilegal though (see ukspeedtraps link above).