The elderly, but not all of them
You can only drive a car at 18 here so teens isn't an option really, but generally the younger the more wreckless I'd generalise
People on cellphones are most definitely the WORST
Some women can be pretty nasty
Here in Portugal I find most men think they own the road and love to cut off women drivers and swear obscenities at them through the rolled-up window, and also most NEVER signal (god forbid
)