Headway h between the lead and following vehicles at time t. Lead and following vehicles use constant speed models, respectively.
| 1 | 
| xl0 | location of lead vehicle at time  | 
| ul0 | pre-breakdown speed of lead vehicle, a number | 
| ul3 | breakdown speed of lead vehicle, a number | 
| theta | a  | 
| t3 | transition time, a number | 
| xf1 | location of following vehicle at time  | 
| t | time, a number | 
| t1 | deceleration time, a number | 
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