time2roll wrote:
valhalla360 wrote:
Of course, if that's the case, it has a ventilation system so the heavier than air CO2 doesn't build up...not to mention vehicles cruising at 30-60mph will move a surprising amount of air.
Mostly, it's a CYA.
I think it is caution for if there is a wreck. All traffic could be stopped and blocked with propane leaking.
In other words, CYA (Cover Your A*&)
There could also be a blockage and a gas tank leaking but we don't shut off the fuel line before going into a tunnel...and it won't matter if the tank is damaged anyway.