An investigation into a deadly pedestrian crash on I-85 caused hours of delays through Gwinnett County for the entirety of the Thursday morning rush.

PHOTO GALLERY: Deadly pedestrian crash on I-85 in Gwinnett County

All southbound lanes were shut down for more than three hours at Boggs Road while authorities were on scene. Even after the lanes reopened at 7:40 a.m., major delays remained from Buford to Lawrenceville, according to the WSB 24-hour Traffic Center.

Gwinnett County police towed a gold SUV and a yellow car from the scene of a deadly pedestrian crash before reopening the southbound lanes of I-85 at Boggs Road. The crash investigation shut down the interstate for more than three hours Thursday morning.

Credit: JOHN SPINK / JSPINK@AJC.COM

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Credit: JOHN SPINK / JSPINK@AJC.COM

Authorities first closed the interstate north of the Ga. 316 interchange just before 5 a.m., the Traffic Center reported.

During the shutdown, southbound traffic was being diverted off the Pleasant Hill Road exit onto the access road.

Gwinnett County police investigated a deadly pedestrian incident in the southbound lanes of I-85 at Boggs Road. Traffic was diverted off the interstate onto an access road for hours Thursday morning.

Credit: JOHN SPINK / JSPINK@AJC.COM

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Credit: JOHN SPINK / JSPINK@AJC.COM

At the height of the delays, there were seven miles of bumper-to-bumper backups, and I-85 was a parking lot. Commutes all across the Eastside were impacted as motorists crowded onto surface streets, WSB traffic reporter Mark Arum said.

The southbound lanes of I-85 were blocked at Boggs Road.

Credit: JOHN SPINK / JSPINK@AJC.COM

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Credit: JOHN SPINK / JSPINK@AJC.COM

The investigation also impacted Gwinnett County Transit passengers. All express routes were delayed as a result, the agency said in a tweet.

Police have not released the name of the pedestrian or any other details about the crash.

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Police said a person was hit and killed on Interstate 85 in Gwinnett County Thursday morning.