So on the Paradox stream they said that "heavy traffic" is ONLY for industrial. They are the actual trucks and such.
Commercial that needs goods is being delivered to by vans which are not heavy traffic. So you can totally ban heavy traffic in residential and commercial zones as long as your industrial delivery trucks can get to the industrial zones.
Also, noise pollution affects the health of residential but also the business of commercial. So having high noise in your commercial zones and offices can lead to them not leveling up or downright closing.
Placing trees btw decreases noise pollution and thereby slightly raises landvalue.
Commercial that needs goods is being delivered to by vans which are not heavy traffic. So you can totally ban heavy traffic in residential and commercial zones as long as your industrial delivery trucks can get to the industrial zones.
Also, noise pollution affects the health of residential but also the business of commercial. So having high noise in your commercial zones and offices can lead to them not leveling up or downright closing.
Placing trees btw decreases noise pollution and thereby slightly raises landvalue.