The hill on SE jennings between Jade Ct and Pagoda is blocked my multiple vehicle accident. Traction control devices were not in use on this significant grade. A conversion van slid off the road when a ford pickup stopped to avoid a collison, then a sedan collided with that pickup. The responding tow truck got stuck and another tow truck had to be called to rescue it. They are unable to reach two of the vehicles still on the hill as it has been for the last couple of hours. This ia the third collision ive witnessed since 10am today. We have closed the road with flares while angry oncoming drivers have to turn around to avoid sliding into the mass of activity on the hill. There are no reported injuries.