LPG is massively used in japanese taxis. But quite unpopular for cars that are stored in garages. Since they tend to explose in a Jerry Bruckenheimer kind of way. (Forbidden in underground parkings at least in france, fire dept asked that the LPG cars be identified clearly since they are excessively dangerous for the crews trying to put out the fire, needs more a bombsquad than firemen)

 

The chance of "bleve" (pressurised gas cylinder exploding) is very low unless if it the gas cylinder itself that is leaking and burning the escaping gases causing a hot spot right at the leak.

In an underground car park the gasoline tanks of the regular cars will explode much more likely in terms of a big fire there (it's almost guaranteed) while the pressurised gas cylinders will remain sealed and safe until the temperature gets to the point of actually melting the thick high-pressure steel of the cylinder itself, which is unlikely.

It's one of those deals that SOUNDS really scary so some comittee decision maker bans the item, even though it is a very low risk of actually happening.

 

I know it's the intarweb and arguing is useless. But on your side you have theories, on my side I have dead firemen and proposed legislation doing their ways...

video explosion d'un reservoir GPL de voiture - feu, pompier, voiture - videos Ma-Tvideo France3

And here last june ONE gpl railcar derail, 2 building destroyed and 13 dead.

Un wagon de GPL explose en Italie: 13 morts et 35 blessés graves - Libération

Yeah, regular gas could have burned too. Nonetheless... GPL/LPG is quite dangerous. And you statement of very low chances of explosion is downright wrong.

 

The actual DOT and other international and federal safety regulations on pressurized fuel tanks have about 20 times the safety requirements built into the tanks than what your typical vehicle has on its gasoline or diesel fuel tank.
The most common leak is from poor maintenance or improper line and or line fittings having been used by cheap home conversions. I have seen and fixed more than a few. And even then a line or fitting leak is easily stopped just by turning off the supply valve on the tank.

An actual high pressure fuel tank will not ever actually explode in any realistic conditions. It will build up pressure and vent in a controlled fashion and rate.
In vehicle applications the vent port itself is required to blow the venting gasses up and away from the vehicle. This greatly reduces the actual radiant heat effects returned to the vehicle and tank should the gas be ignited.
Should a venting tank be ignited its would only need a quick shower of cold water to reduce the internal pressure to the point the vent closes and extinguishes the flame.

A burning gasoline or diesel tank wont do that if its been heated up hot enough to be boiling the fuel out. The burning liquid fuel will just float on the water and move to other places where its not wanted like down drains or under other vehicles which have their fuel tanks mounted underneath.

The safety horror mythes about pressurized fuel systems are almost beyond Hollywood levels of gross exaggeration.

__________________
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I wonder if there are any large powerful corporate interests that might have something to gain from making LPG less popular??? Nah probably not.


Reminds me of that a-hole Edison publicly electrocuting horses and elephants with AC to show how "dangerous" it was. Of course he was promoting public safety, nothing at all to do with the fact that the competition Westinghouse used AC and Edison's company was using DC.