So I was taught that undertaking is technically not illegal but it’s bad practice, hogging the overtake lanes when there’s nobody on your left is the actual offence. (UK before anyone driving on the incorrect side says anything). But yeah there’s still a reasonable speed to keep at on main roads in most conditions.
So I was taught that undertaking is technically not illegal but it’s bad practice, hogging the overtake lanes when there’s nobody on your left is the actual offence. (UK before anyone driving on the incorrect side says anything). But yeah there’s still a reasonable speed to keep at on main roads in most conditions.
I don’t know about associated punishments, but the highway code is clear.
Rule 267: […]Overtake only on the right.
Rule 268: Do not overtake on the left or move to a lane on your left to overtake.
It goes on to clarify that, in heavy traffic, the left lane could be moving faster and that keeping up with the flow is OK.