Traffic was blocked on Highway 37 and Highway 4 after accidents, and roadwork on Highway 121 required a detour Thursday.

From Bay City News:

(BCN) Westbound state Highway 37 in Vallejo has reopened after being shut down for hours this morning because of a fiery crash that killed a big-rig driver, a California Highway Patrol spokesman said.

A collision between an Ace Hardware big-rig and a white pickup truck was reported at about 6:40 a.m. on westbound Highway 37 just east of state Highway 29, CHP Officer Chris Parker said.

The collision caused the big-rig to fall from the overpass, Parker said. It landed in a grassy area below and caught fire.

Parker said two witnesses who were driving north on Highway 29 saw sparks coming from the big-rig before it fell from Highway 37.

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The two, along with an off-duty paramedic, ran to the big-rig as it burned and pulled the driver out of the cabin, Parker said.

The driver was taken to a hospital where he was pronounced dead, Parker said.

The pickup truck's driver refused medical attention, the officer said.

Hazardous materials were in the big-rig's trailer, and a Solano County hazardous materials team has responded to the crash site, Parker said.

The collision remains under investigation, he said.

The connector from northbound Highway 29 to westbound Highway 37 remained closed as of 10:15 a.m.

From 511.org:

On Thursday, January 10, a Severe Traffic Alert is in effect for northbound CA-29 at CA-37 in Vallejo due to a major injury accident. Only the right lane remains closed. Motorists are advised to expect delays and avoid the area. There is no estimated time to reopen the roadway.

Roadwork Closes Both Directions of CA-121 in Napa County Until 6:00 p.m.

On Thursday, January 10, Caltrans work is closing both directions of CA-121 in Napa County, between Soscol Avenue / Silverado Trail and Sousa Lane. Motorists are advised to avoid the area and expect delays. A short detour is in place. The roadwork is scheduled until 6:00 p.m

Tractor Trailer Accident Blocks Westbound CA-4 in Concord

On Thursday, January 10 at 8:48am, there is a Severe Traffic Alert on westbound CA-4 before Port Chicago Highway in Concord. All lanes are blocked by a tractor trailer accident. Traffic is being diverted onto southbound CA-242. Motorists are advised to avoid the area and expect delays. There is no estimated time to reopen the roadway.

Full Freeway Closures Scheduled in Pittsburg/Antioch on CA-4 Week of January 6

Due to overnight Caltrans construction activity in the Antioch/Pittsburg areas, weather permitting, all lanes of eastbound CA-4 will be closed at Loveridge Road Thursday through Friday mornings from 12:30am to 5:30am. All lanes of eastbound CA-4 will be closed between Somersville Road and Lone Tree Way on Friday morning from midnight to 4:00am; and, on Saturday morning from 1:30am to 7:00am.

All lanes will be closed on westbound CA-4, between Somersville Road and Loveridge Road, Wednesday through Thursday from 11:00pm in the evening until 3:30am the following morning; and, on Saturday morning from midnight to 5:00am.

Signage and detours will be in place. Motorists are advised to expect delays and to take alternate routes to avoid these areas during these closures. The Caltrans project to widen CA-4 from about a mile west of Loveridge Avenue to about a mile west of Hillcrest Avenue in Antioch continues. For more information, click here.

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Crashes, Roadwork Shut Sections of Highways 37, 4 and 121 Thursday