Should you ever overtake a funeral procession?

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There is a naming and shaming of a taxi driver on Facebook at the moment. The passenger (funeral employee) in the funeral car has taken photos of a black Vectra 'overtaking at 60mph' after flashing his lights and driving up behind. This was a single carriageway. Obviously that is unacceptable, but there are many posters stating you shouldn't overtake a funeral procession even on a dual carriageway.

The funeral director company page are asking for the post to be shared etc. It won't be difficult to identify who it was as the numberplate and taxi firm are clearly visible. I guess a call to the taxi company wasn't sufficient.

I'm not a fan of all this tell-tale trial by social media as you only get one side of the argument and it's all a bit playground but this is the modern way.

So, would you (courteously) overtake a funeral procession on a dual carriageway or just sit behind?

[Vron]

sparkythecat said:

In bygone days the coffin would have been carried by pall bearers, or by a horse drawn carriage, with mourners on foot. Given that very seldom happens these days
why do funeral convoys need to travel so slowly?

Probably so the body doesn't rattle around inside the coffin? Would be pretty upsetting hearing your nan thudding from side to side each time the hearse took a corner.