Leaving Springfield going south there is an S-curve on I-91 going under the south-end bridge. As the curves straighten out, State Police will sit on the RH shoulder of highway in a black Ford Excursion or Crown Vic taking radar with a chaser cruiser up ahead of him. I usually see the Expedition doing spot checks for tractor trailors and other large vehicles but as recently as 5/21/03 doing speed traps too.