The findt1ab returns the time tf1 and the location xf1 and speed uf1
of the following vehicle when the driver begins to decelerate.
| 1 | 
| xl0 | lead vehicle location at time  | 
| xf0 | following vehicle location at time  | 
| uf0 | following vehicle speed at time  | 
| ul0 | lead vehicle speed at time  | 
| tseq | time sequence of the lead vehicle  | 
| useq | speed sequence of the lead vehicle  | 
| t1 | start time, a number | 
| t2 | end time, a number | 
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