So sorry for your loss.
If driving here people don't stop but slow down and let them pass. If I am walking I will stop and bow my head until it has passed, my Son has always done this and his friends thought he was strange, I've always been taught it was manners. My Gran always used to hold a button on her clothes and bow her head until they passed. apparently it is an old Victorian superstition....(It is bad luck to meet a funeral procession head on. If you see one approching, turn around. If this is unavoidable, hold on to a button until the funeral cortege passes.)