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Horse and mule obey traffic rules and trot on to a California highway

Click to play video 'Horse and mule obey traffic rules and trot on to a California highway' Horse and mule obey traffic rules and trot on to a California highway
WATCH: Drivers in northern California weren't dreaming when they shoulder-checked to find a horse and mule trotting next to them early on Monday morning – Mar 27, 2017

That mustang in the rearview mirror turned out to be a real horse running on a Northern California highway – followed by a mule.

Commuters east of San Francisco on Monday were stunned to see a white horse and a brown mule running across Interstate 680.

Steve Burdo with Contra Costa County Animal Services says the animals broke through a fence about a mile away.

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The pair adhered to the vehicle code and used an on-ramp to enter the highway.

Authorities shut down lanes shortly before 7:30 a.m. as motorists shot cellphone video and officers rounded up the four-legged fugitives.

Burdo says the horse, a gelding named Striker, appears to have led the breakout. He says Hank the mule is more of a follower.

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