Nothing creates a sense of occasion like a procession. What is a procession exactly? A procession is a ceremonial way of going from A to B, often on foot.
In a conventional funeral procession the funeral director walks the final few hundred yards in front of the hearse, which is followed by the cars—usually glossy, black limousines laid on by the funeral director—containing the chief mourners. It can look very impressive.
It is not a very long procession, though.
And most of the following cars don’t reach the destination because, at a crematorium or cemetery, they break ranks to find a parking place. In the meantime, everyone else has got there first, parked and gathered outside the chapel.
There are other possibly unsatisfactory elements. Why should it be the funeral director who walks tall while those closest to the person who has died are huddled, half hidden, in a car? Whose funeral is this, dammit?
If you like the idea of a procession, think about who is going to lead it and where it will start.