When Waze suggests a path with a tunnel, the estimation time is always incorrect, and I cannot conclude that this is the best route. For example, if the time to pass a tunnel without traffic is 2 min and I pass it in 10 min (because of traffic), then after I came out of the tunnel, the estimation time become +8 min. I think Waze uses instantaneous velocity and GPS location to estimate traffic. In tunnels, GPS doesn't work (and many of tunnels don't have beacons), so Waze does not compute traffic in tunnels. This issue can be easily fixed using the entering time and exit time to calculate the average speed in tunnels.