The first-ever complete closure of the George Washington Bridge occurred on August 6, 1980, when a truck carrying highly flammable propane gas across the bridge started to leak. As a safety precaution in case the fuel started to ignite, traffic across the bridge was halted for several hours, and 2,000 people living near the bridge were evacuated. Since the George Washington Bridge is the primary crossing between New Jersey and New York City, the closure caused traffic jams that stretched for up to , and the effects of this congestion could be seen more than away. Two police officers eventually plugged the leak with an inexpensive device. Up to that point, trucks carrying flammable material had been allowed to use the George Washington Bridge. After the incident, New York City officials conducted a study on whether to prohibit hazardous cargo from traveling through the city.