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More than 2,000 trail riders are making their way into town this week to help kick off the Houston Livestock Show and Rodeo, which begins Monday.

As large caravans of horses and wagons wend through Houston's streets and feeder roads, riders urge drivers to remember to give them space.

Just consider what happened Thursday morning: A white Hummer struck a horse as the Sam Houston Trail Ride rode south on Tomball Parkway, just inside the Grand Parkway.

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The horse and its rider, Tucker White, 22, are both fine to continue riding. But the horse has some blood on its rump after being struck by the Hummer's headlight.

Trail riders who saw the collision say the driver was ignoring the mounted marshal's instructions to leave an open lane between the horses and traffic.