Comment Waze is a community sourced map (Score 1) 611
Anyone in the area with a Waze account has the ability to modify the map. There are a few things you can try...
Make sure the road is the lowest level of road below highway. Heck make it a dirt road; still routable but Waze should skip it.
Make the turn-off red to disable it. Of course other people might complain and want it back on, but if you have active moderators in the area they should know why it's off.
Waze is doing what it's supposed to do. It notices a faster route and directs people to it. Any GPS app would have the same problem. As stated above, if you don't like it, get the city to change the road.