A deputy-involved crash Wednesday morning caused traffic problems on southbound Interstate 95 near Copans Road in Pompano Beach.
All lanes were back open by 10 a.m.
Pompano Beach Fire Rescue transported Broward County Deputy Daniel Rivera, 32, by ground to Broward Health North with life-threatening injuries.
"He has very severe injuries. Nurses and doctors have told us he's in very critical condition," Broward Sheriff Scott Israel told the Sun Sentinel . "Undergoing surgery as we speak. We ask for everyone's prayers and thoughts for him and his family, and the BSO family."
The deputy's cruiser slammed into a tree on the side of the interstate as he headed to work.
"At this point, our accident investigators believe that the deputy began applying the brakes, lost control of his vehicle and went off the road," the sheriff told the Sun Sentinel.
There were no other injuries.
A Broward County Sheriff's Office communications training specialist on his way to work was the first person at the scene. That employee notified BSO of the crash and Rivera's condition at 6:16 a.m. It is unclear what time the crash happened.
BSO's Traffic Homicide Unit is investigating to determine what circumstances led to the crash.
Rivera started at BSO in 2003 as a Department of Detention deputy. He transferred to the Department of Law Enforcement in May 2012. He is assigned to the Pompano Beach district.
Anyone who witnessed the crash is asked to call the BSO Traffic Homicide Unit at (954) 321-4840 or anonymously report information to Crime Stoppers of Broward County at (954) 493-TIPS (8477) or online at www.browardcrimestoppers.org.
The Associated Press contributed to this report.