merge3: 'merge3' produces 't-x' trajectories for a pair of lead and...
In cartools: Tools for Understanding Highway Performance

merge3 produces t-x trajectories for a pair of lead and following vehicles for brktrial3.

1	merge3(i,df1,df2,leff,step,xfunnel,usd,ylim,type)

`i`	vehicle, a number
`df1`	leading vehicle, a matrix
`df2`	following vehicle, a matrix
`leff`	vehicle length, a number
`step`	time-step size, a number
`xfunnel`	upstream location of bottleneck taper, a number
`usd`	speed volatility (mph) for `umn`, a number
`ylim`	for plot, a vector
`type`	TRUE to create plots or FALSE otherwise, a logical

The merge3, a wrapper function for bmfree2, xabparam and hsafe, returns a smooth hsafe rule t-x trajectory. for the following vehicle. The lead vehicle trajectory is not affected.