I've not noticed the adverb snubbing here in Québeec, dxb. I wonder if it is common elsewhere.

I may be wrong but doesn't it take a spark, or a whole lot of pressure, to ignite a gas?

AND...

As to drivers...I hate to say it but I don't understand your question. I'm thinking it is just the difference in how things are described.

direction indicators: Do you mean turn lights? A.k.a. flashers. Those blinking thingies at the back and front of the cars you need to use when changing lanes and turning?

I'm not sure because I don't know exactly what you mean that they only use them when overtaking. What do you mean by overtaking?

Mon dieu but it amazes me how the English language can have so many variations.