In RL, one of the easiest things for people to notice is the color of a vehicle. They might not know if it was an Audi or a BMW, but the color at least is something memorable when you almost get run over on the street.
So the idea is simple, like with players when their most noticeable clothing/attribute is included in the message as they move around (An average fellow wearing a white shirt, for example), it would be nice if vehicles included their color, ala:
A black Scarab Cargo AV floats away on its cushion of hot air, heading up.
or: A petite urchin trundles in slowly riding a red HondaMitsu Cricket from the east.
While we're at it, sometimes vehicles will also use 'The' instead of 'a', ala:
The Scarab Cargo AV floats in […]
I think the singular reference (the) promotes smallworlding as opposed to using the more generic 'a'. So if that could be swapped out at the same time I think it might help, too.