BOULDER COUNTY, Colo. (CBS4)– A jackknifed semi truck blocked eastbound lanes of US 36 on Monday.

The semi was jackknifed on the hill approaching Davidson Mesa about 11:37 a.m. That blocked all lanes of traffic except for the express lane. Traffic was getting through in that lane but there were significant delays in the area.

us36 crash cdot frame 14863 Jackknifed Semi Disrupts Traffic On Highway 36

(credit: CDOT)

Investigators with the Colorado State Patrol believe the semi driver suffered a medical incident that triggered the crash. The driver, a 61-year-old male from Missouri, passed away either en route or at the hospital.

us 36 crash Jackknifed Semi Disrupts Traffic On Highway 36

Copter4 flew over the jack-knifed semi on US 36 (credit: CBS)

Another crash involving two vehicles and an ambulance also contributed to the traffic delays. The ambulance was responding to the jack-knifed semi when it was side-swiped by another vehicle.

copter monday 1225pm frame 14966 Jackknifed Semi Disrupts Traffic On Highway 36

(credit: CBS)

No one was injured in the second crash.

Drivers were urged to take an alternate route and avoid the area.

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