18-Wheeler Fire in Downtown D.C. Prompts Emergency Response, Traffic Disruptions on 3rd Street Tunnel

An 18-wheeler caught on fire Tuesday morning inside the northbound 3rd Street Tunnel near New York Avenue NW in downtown Washington, D.C., prompting an emergency response and traffic closures. According to Fox5DC, D.C. Fire and EMS officials said the passenger compartment of the truck was fully involved when firefighters arrived on the scene, leading to a call for a full box alarm and a hazardous materials unit.

The incident caused significant traffic disruptions, with the northbound stretch of the 3rd Street Tunnel between D Street NW / U.S. Capitol (Exit 9) and U.S. 50 / New York Avenue closed off to traffic. As per an update from AlertDC cited by Fox5DC, southbound lanes were subsequently reopened, but the northbound lanes remain shut down. Meanwhile, WUSA9 reported that northbound lanes were partially opened after the Massachusetts Avenue exit later in the morning.

The truck was carrying roughly 100 gallons of diesel fuel, adding a layer of complexity to the emergency response. Firefighters were able to secure a water supply and extinguish the blaze without injuries or apparent damage to the tunnel structure. "Crews checked smoke conditions in the structure above the tunnel and found no issues," confirmed DC Fire officials in a statement obtained by Fox5DC. The exact cause of the fire remains unclear, but hazmat crews continued to work on addressing the potential dangers posed by the truck's diesel fuel, as noted in a DC News Now article.

Motorists were advised to avoid the broader tunnel area and seek alternative routes. D.C. police, as highlighted by DC News Now, informed that all lanes and on-ramps leading into the northbound lanes to the 3rd Street tunnel, from Interstate 395 to New York Avenue, NE, were to remain closed during the response period. The traffic impacts are expected to ease as the authorities fully reopen the northbound lanes, once deemed safe for public use again.