What was the point of that comment? Really? It's not just some random builder's van they're driving there, it's an ambulance! I was under the impression that everyone knows that when an ambulance is coming on blues and twos, you get out of the way! If, as you seem to think, he is deaf, he could have waited for the bus to go past before he starts to cross? Tom isn't trying to humiliate his crewmate her or criticise his driving, he's just trying to make a statement about how dangerous it is driving at high speed... or something...