题目选项分析

Last June, Endsville installed highway traffic cameras, in the hope that drivers along the highways would reduce their speeds. This June, the number of motorists caught speeding by the traffic cameras is nearly twice that caught last June.

All of the following, if true, can help account for the increase in motorists caught speeding by traffic cameras EXCEPT?

【选项】Since the cameras are virtually hidden, many motorists remain oblivious to the fact that the city has installed traffic cameras.