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The vehicle then rolled across the road, colliding with a wall.
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Wouldn't the driver have applied the parking brake before evacuating?
How, then, would it 'run away'?
I would imagine that any fire that burned through (plastic) pipes would enable the spring brakes to apply rather than release . . .
Then you have a problem moving the casualty (like when a Routemaster ended up in Highgate pond after damaging the brake-lines when it left the carriageway, applying the spring brakes . . .
. . . so, bus in pond with spring brakes applied and (submerged) pipes damaged).