We were driving on the "back-roads" highway, 70, from Clovis, NM to Roswell, NM. The highway speed limit was 75 mph, which I had been abiding by. Suddenly, as we approached the VERY SMALL, run-down town of Elida, the speed limit dropped from 75 to 50 to 35, with each drop being less than one tenth of a mile apart. I put my brakes on to slow down, but short of slamming on them, skidding, and possibly having an accident, I apparently didn’t slow down sufficiently. The (probably one-and-only) policeman stopped me and said I was doing 57 in a 35 zone. I was in the process of trying to slow a fully-loaded, full-sized van from 75 to 35 mph. I told the officer I was braking and slowing down, but it didn’t matter. I felt fully pressured, being from out-of-state with a van full of people, pets, and personal possessions, to say I wanted to handle it by mail versus "returning to court". However, I did not know I would then be forced to an admission of guilt because if I refused to sign, I would be "detained immediately and held in custody until taken to appear before a judge, when one becomes available". This seems like a form of extortion to me. There is absolutely nothing in this town, and I am certain that this town has set up this speed trap and that their officer just lies in wait all day to give out tickets to make up his salary.