→Parking Lot Roads
The current recommendation is to use a single parking lot segment for every location which connects to external streets and then use street type segments for all main drive segments within the parking lot itself. This reduces the penalties and Waze will choose better routes within parking lots and not go against turn restrictions. But because that single parking lot segment is there, Waze should not route through the parking lot to get to other destinations.
Parking lot roads also provide the benefit of allowing turn restrictions to be properly set upon entry and exit of the parking lot. In addition, the proper use of parking lot roads can also help to avoid automated traffic jam reports as well as Papyrus Map Problems related to Wazers driving in unmapped parking lots.
Related forum post from Waze employee, sagi - http://www.waze.com/forum/viewtopic.php?f=10&t=13825&start=20#p117202