For the first time, a drive-thru mass vaccination site at the Circuit of the Americas hosted by Travis County and its Central Texas neighbors will not require appointments. Beginning April 23, the site will allow anyone age 16 and up to receive a first dose of the Pfizer coronavirus vaccine, whether they have signed up ahead of time or not.

"This weekend will get us one step closer to where anyone who wants a vaccine can get a vaccine,” Travis County Judge Andy Brown said in a news release. "If you can make it to COTA this weekend, now is the time to get your vaccine.”

The COTA mass vaccination site is jointly operated by the Travis, Caldwell, Hays and Bastrop counties, which together make up the Central Texas Counties Vaccine Collaborative. Since late February, the counties have partnered with CommUnityCare and Ascension Seton to administer thousands of shots each weekend. No-appointment shots will be available at 9201 Circuit of the Americas Blvd., Austin, on April 23 from 9 a.m.-noon and April 24 and 25 from 10 a.m.-3 p.m. Sixteen- and 17-year-olds need the signature of a parent or guardian to receive a shot.

Several of Travis County's largest vaccine distributors have also expanded to offer walk-up vaccines this week as the supply has exceeded the demand for the shots. Austin Public Health announced it would pilot walk-up vaccine access at the Delco Activity Center on April 22 and 23, offering the Moderna vaccine to adults age 18 and up. UT Health Austin, which administers the Pfizer vaccine, likewise has begun accepting walk-ins from 9-11:30 a.m. and 1:30-3 p.m. on weekdays. Both APH and UT still recommend signing up for appointments ahead of time, however.