zipper: The 'zipper' function can be used to simulate interaction...
In cartools: Tools for Understanding Highway Performance

Description Usage Arguments Value Examples

The zipper function can be used to simulate interaction among three vehicles in car following on a single lane or three vehicles merging on a two-lane highway.

zipper(tstart, tend,
    ustart1, uend1, xstart1, xend1,
    ustart2, uend2, xstart2, xend2,
    ustart3, uend3, xstart3, xend3)

`tstart`	start time, a number
`tend`	end time, a number
`ustart1`	start speed (mph) for vehicle in lane 1, a number
`uend1`	end speed (mph) for vehicle in lane 1, a number
`xstart1`	start location for vehicle in lane 1 (feet), a number
`xend1`	end location for vehicle in lane 1 (feet), a number
`ustart2`	start speed (mph) for vehicle in lane 2, a number
`uend2`	end speed (mph) for vehicle in lane 2, a number
`xstart2`	start location for vehicle in lane 2 (feet), a number
`xend2`	end location for vehicle in lane 2 (feet), a number
`ustart3`	start speed (mph) for vehicle in lane 3, a number
`uend3`	end speed (mph) for vehicle in lane 3, a number
`xstart3`	start location for vehicle in lane 3 (feet), a number
`xend3`	end location for vehicle in lane 3 (feet), a number

zipper uses a deterministic model and animation to illustrate an “idealistic” situation, a so-called a “zipper merge.”

1
2
3

zipper(0,60,90,90,0,5000,90,90,-200,4500,90,90,-500, 4000)
zipper(0,40,85,90,0,4000,90,99,0,4500,90,90,-500, 4200)
zipper(0,5,60,20,0,500,65,20,-100,467,80,20,-350,433)