Patent ID: RE44976

Claim:
Apparatus for determining speed and acceleration of a motor vehicle traveling on a roadway comprising: a first radiation source producing a visible entrance laser first beam and arranged at one side of the roadway; a first detector arranged at an opposite side of the roadway to receive said visible entrance laser first beam from said first radiation source for producing an output signal indicating a presence or absence of the visible entrance laser first beam; a second radiation source producing a visible exit laser second beam and arranged at said one side of the roadway and being spaced apart by a predetermined distance from said first radiation source; a second detector arranged at said opposite side of the roadway to receive said visible exit laser beam from said second radiation source for producing an output signal indicating the presence or absence of the visible exit laser second beam; wherein front and rear wheels of the motor vehicle each interrupt said visible entrance laser first beam and said visible exit laser second beam and the interruptions are detected by said first and second detectors; and vehicle emissions testing means for obtaining exhaust emissions information for the motor vehicle; and analyzing means receiving said output signals from said first and second detectors for calculating the speed and acceleration of the motor vehicle to be used in combination with the obtained exhaust emissions information .