Is speeding a charge ploy to rush into motorists' pockets?

Driving on the Nakuru-Eldoret highway on Friday morning, I was literally fished out of a long convoy of vehicles by a traffic policeman at Salgaa trading centre, my driving licence impounded and ordered to drive to the nearby police post to face a trumped-up charge of speeding alongside scores of other suspects.

To the consternation of the many people in the crowded wooden enclosure, the officer preparing the charge sheet began by asking for the make, colour and registration number of my vehicle! On what basis had I been arrested in the absence of all these pertinent details? What had their speed-gun captured to warrant the arrest?