Power lines and bridge heights are the reason for the collapsibility of the trike. Below are my next 2 model images showing the lower front frame addition to the trike in both collapsed and extended modes. FYI, there is a 14' minimum bridge clearance law, so all bridges going over highways and freeways have to be at least 14' tall on the underside. Power lines are typically taller, as they have to be a distance away from the vehicle. By making the trike collapsible I can go under bridges and power lines. The maximum height of the trike in collapsed mode is 13' 6", and in extended mode is 50'.

Collapsed view:

Extended view: