Traffic jams are a common occurrence in many cities and towns, especially during rush hour. They are caused by an excessive number of vehicles on the road, resulting in congestion and delays. Two common terms used to describe traffic jams are snarls and tieups. A snarl is a situation where traffic is blocked or slowed down due to an obstruction or accident. A tieup is a situation where traffic is completely stopped due to an obstruction or accident. Both of these terms can be used to describe traffic jams.