Duplicate tree-level description in CLI prompt

I am writing a tool that enables a user to traverse a tree-structured data set, which describes a set of roads, each road can have n lanes.

The idle, starting prompt looks like this:

Jeep@CurrentlyDriving>

The user can then traverse to other roads using the DRIVE command

Jeep@CurrentlyDriving> DRIVE Road1

Jeep@CurrentlyDriving\Road1>

The user has the ability to change lanes using the LANE command.

The problem

Should the user use the LANE command (but only if he does so), I want to CLI to reflect that change, i.e, show that a lane has been changed since entering a certain road. i.e,

Jeep@CurrentlyDriving\Road1> LANE 1

Jeep@CurrentlyDriving\Road1????????>

What would be the best way to reflect the lane change (should be reflected where the ???`s are) without significantly 'damaging' the CLI structure?