My dh commutes 1 hour 15 mins (roughly) to work every day. However, he normally works a pretty fixed 7.5 hour shift, so his overall days are not as long as your dh's. Also, working shifts, he generally hits the motorway outside of rush hour (generally he leaves before 6 and is back mid-afternoon, or else leaves around lunchtime and gets back sometime in the evening, with occasional night shifts). He's a bit p-ed off atm, but basically he took the job because it was a job that interested and stimulated him. Moving closer to his work wasn't an option because (a) I work too, nearer to where we live, (b) the dds are settled in school, and (c) he's on a 2-year posting, after which he may well end up moving again. So he just gets on with it.
IMO YANBU to worry about him. I do worry about my dh when the weather is bad (he commutes on the M62 which is a notoriously horrible road) or when he goes by motorbike (depending on weather). However, I think that to judge whether YABU or not in general we'd need to know more about how your dh feels about his job. If he loves his job and it's important to him, and if it's something that he couldn't do nearer to home, then it would be unreasonable to expect him to give it up because of the driving.
Does he have other job possibilities nearer to home? If he gave up work would you be in a position to support the family for a while? How feasible is it for you to move closer to his work? Could he use public transport rather than commuting by car? (You don't actually have to answer these questions, but they are the kinds of things you'd need to ask yourself if you really wanted to change this situation. Otherwise, I think you are going to have to grit your teeth, worry, but live with it.)