I'm in the US. I'm 10 miles from my work, in one of the eastern-most suburbs. I cross dozens of major stroads (arterials with HEAVY vehicle traffic) in my commute. The temps here in the summer are regularly 90+ degrees.

Solution? I got an e-bike. Again, I'm not saying everyone can bike the whole way. Take a bus for the first or latter half. It can be done if you actually want to make the change.