Estimation, pacing, radar, lidar, and timing are all proper in MA.

Estimation is basically *exclusively* listed in conjunction with radar/lidar... as in, the officer first estimated the vehicle traveling greater than the posted speed limit, then used technology to confirm and determine the exact speed.

There is a Ch/Sec for "faster than reasonable" for conditions"... where estimated would be proper in and of itself... but you wouldn't have the specific dollar fine amount that is calculated based on actual speed / posted limit.