Crying in the car
I spend quite a bit of time in my car, and a lot of tears have been shed in it. I would get blindsided by grief while driving (easy to happen since I'm usually by myself), and even several years after losing my daughter I can't tell you how many times I'd set out to a social engagement, feeling good and looking forward to it, only to have some thought hit me and trigger a flood of sadness and tears.
If anyone else goes through this, I found one thing that has helped me: audio books. They don't distract me from my driving, but they do distract me from my thoughts. I still feel periods of intense grief, but now they come at other times. Books on tape and CD are available at libraries, and I also buy them used (and cheap) on eBay.