SACRAMENTO (CBS13) – In the middle of the holiday travel rush, there’s another kind of rush as well: the rush for the COVID-19 booster shot.

Many booster shot clinics have seen unprecedentedly long lines as families rush to be doubly vaccinated for the holidays.

READ MORE: 'He Had To Watch... As This Monster Did What He Did': Sacramento Family Of Texas Shooting Survivor Speaks

Particularly walk-in clinics have seen car lines around the block with the high demand for these booster shots.

One clinic in San Mateo saw particularly long lines.

READ MORE: Man Found In Car Intoxicated, Arrested For DUI In Lodi

“It’s worth getting in line,” said one woman, despite waiting for what might as well be the drive-thru at In-N-Out during rush hour.

By noon, the clinic had to turn people away due to an inability to vaccinate so many.

MORE NEWS: Man Arrested After Running Stop Sign Then Fleeing From Police

Being the first weekend the booster shot was available to all adults, lines were to be expected. However, many clinics did not realize that the demand would be this high.