At least two tractor trailers were involved in a series of multi-vehicle crashes Tuesday, leaving at least four people injured and snarling traffic in Virginia along I-95 and Route 1 in Stafford and Prince William counties for hours.

A series of multi-vehicle crashes on I-95 in Stafford shut down the interstate Tuesday afternoon. (Courtesy Virginia State Police) Virginia State Police A series of multi-vehicle crashes on I-95 in Stafford shut down the interstate Tuesday afternoon. (Courtesy Virginia State Police) Virginia State Police ( 1 /2) Share This Gallery: Share on Facebook. Share on Twitter. Share via email. Print.

WASHINGTON — At least two tractor trailers were involved in multi-vehicle crashes around noon Tuesday that closed the southbound lanes of Interstate 95 in Stafford County, Virginia.

Virginia State Police say they responded to a series of chain-reaction crashes between exit 143 (Aquia/Garrisonville Road) and exit 140 (Courthouse Road). At least four people have non life-threatening injuries.

The results of the crash investigation were not immediately available. VDOT announced shortly after 4:30 p.m. that all southbound lanes of I-95 reopened, but major backups remained well after the usual rush hour, especially along Route 1, which served as the primary detour during the hours-long closure.

#UPDATE: ALL lanes on I-95 southbound are now OPEN. Expect residual delays from multi-vehicle crash near Exit 140 (Courthouse Rd.) and Exit 143 (Garrisonville) in Stafford earlier today #FXBGtraffic pic.twitter.com/iteD0FZXc8 — VDOT Fredericksburg (@VaDOTFRED) September 25, 2018

The area where the crash happened:

Get the latest road and traffic conditions at the WTOP Traffic Center.