If they would enforce the current laws this wouldn't even be thought of.
On my 45 minute motorbike ride into work I see 30-40 people texting and another 10 or so holding the phone to their ear. At least twice a week I'll smell weed while filtering through traffic. Weirdly I smell it more in the mornings than on the way home.
Of course there are no police anywhere and law without enforcement is meaningless.