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A Contra Costa Fire Protection District emergency worker stands near a hole left when a cab veered into an unoccupied home on Claiborne Drive in Walnut Creek on Tuesday.

WALNUT CREEK -- City inspectors yellow-tagged a home and a driver was taken to a hospital after his cab veered off a residential street and into a house Tuesday afternoon.

The crash was reported around 12:45 p.m. on the 1200 block of Claiborne Drive, according to a Contra Costa Fire dispatcher. No one was home at the time of the crash.

The cab appeared to be heading in the direction of the driver's home in the 1100 block of Claiborne when it suddenly veered left and into the home, Battalion Chief Terry Stewart said. The cab ran into the home's kitchen, smashing through a wall and coming to a stop below a window.

A woman who lives in the home arrived at around 2 p.m. and declined to comment. It was not known immediately how many people live in the three-bedroom home.

The driver, who witnesses said was a man, did not appear to be seriously injured, but he was taken to a hospital for observation and to check for any medical issues that may have contributed to the crash, Stewart said. The cab is owned by Veterans Cab of Pleasant Hill.

Neighbor Tim Perez, who was driving home immediately after the accident, said he knew something was wrong when he saw large boulders sitting in the roadway.

The boulders, Perez said, were used as decorations in the front yard of the home.

As he drove up, another neighbor pointed to the home where the cab had crashed. Perez got out of his truck and ran up to the car, which was still in gear.

"I was shocked," he said. "I was thinking, 'This isn't good and it could get much worse.'"

The driver was passed out still in the front seat when Perez turned the car off, he said. Perez waited at the home while fire crews and police arrived.

"If someone had been on the sidewalk or in the home, they could have been really hurt, even killed," he said.

The house suffered structural damage, and water and gas lines may have been compromised, Stewart said. The city's yellow tag means that the residents can enter the home to retrieve their possessions, but they cannot remain inside the house until it can be cleared by inspectors.

Contact Rick Hurd at 925-945-4789 and follow him at Twitter.com/3rdERH.