Fire Lanes as in the land adjacent to buildings reserved for use by fire department equipment? The structural load requirement in the lane itself is pretty brutal.
In my experience it’s something to be negotiated with the fire marshal who has jurisdiction and the structural requirement for the outriggers on a ladder truck pretty much negates anything growing there besides turf grass (maybe a ‘lawn alternative like sedge/liriope within a structurally reinforced soil). The Charlottesville Downtown Mall is negotiated to have a meandering fire lane through the brick pedestrian mall with interspersed tree pits – not entirely ‘lush’, but the strategy may work…