From my house to the interstate, if you follow arterials, you take one left (at a protected light), followed by a right 6 blocks later and then the on ramp. Usually this is the route Google recommends. However during times of heavy traffic Google attempts to shield you from the horrors of waiting for two light cycles at the first intersection by instead directing you to take a left turn 2 blocks early, across traffic to a residential side street. You proceed for two blocks and turn right, then it expects you to do an acute blind left back onto the arterial street (with no light). This maneuver during times of heavy traffic is virtually impossible. The best part is that Google will invariably suggest this route to multiple drivers, so there is always a small line of suckers stacked up at the impossible left, unable to move forward or even back since it's a one lane residential road.