And high drama atop the Westgate Bridge this afternoon when strong winds blew over a mobile advertising billboard being towed by a car. The vehicle was in the outbound lanes when it jackknifed the boarding left dangling perilously over the safety railing and threatening to topple into the Yarra. Long queue's of traffic built up as emergency workers battled to right the trailer. Eventually a heavy haulage truck was brought in to drag it back from the precipice minus it's advertising signs for cheap pizzas.