It probably depends how relieved they are, i.e. how badly they feared they'd never arrive. I nearly did just that the other week: the National Express bus from Heathrow to Cambridge broke down on a roundabout in Luton, so after an hour's wait they sent us on our way on a replacement bus whose driver had to ask us to give him directions from Cambridge park and ride into the city centre, although I later wondered if that had just been a miscommunication due to his poor English, as he had a satnav chattering away to him in some Eastern European language, and while driving he answered his mobile phone only to say "No, I'm driving [pause] I don't understand you, my English isn't good [hang-up]".

So we were all, in fact, quite relieved when he arrived at the bus stop without any problems.

Peter