Answer by taking a quote from the following article:

At the Drive-In is an American post-hardcore band from El Paso, Texas, formed in 1994. The band currently consists of Cedric Bixler (vocals), Omar Rodriguez (guitar, vocals), Paul Hinojos (bass), Tony Hajjar (drums) and Keeley Davis (guitar, vocals). After several early line-up changes, the band solidified into a five-piece, consisting of Bixler, Rodriguez, Jim Ward, Hinojos and Hajjar. At the Drive-In released three studio albums and five EPs before breaking up in 2001.

On November 12, 2000, At the Drive-In was involved in a motor vehicle accident when their touring van skidded out of control on ice and flipped onto its roof. Though the accident left the band shaken, none of the members sustained serious injury - Hajjar and Bixler-Zavala were taken to the hospital for minor injuries and released. In January 2001, At the Drive-In traveled to Australia for the Big Day Out music festival. While performing in Sydney, they left partway through their set after telling the attendance to calm down and observe the safety rules against moshing. After the refusal of the crowd, frontman Cedric Bixler-Zavala told them "You're a robot, you're a sheep!" and bleated at them several times before the band left the stage after performing only three songs. "I think it's a very, very sad day when the only way you can express yourself is through slam-dancing," he proclaimed. The following month, At the Drive-In cancelled the last five dates of its European tour, citing "complete mental and physical exhaustion" of the members.  In March 2001--less than a month away from a United States tour set to commence on April 14--at the peak of their popularity and following a world tour, At the Drive-In broke up, initially referring to the split as an "indefinite hiatus." The band played their last show at Groningen's Vera venue on February 21, 2001. A combination of excessive hype, relentless touring, artistic differences, and Rodriguez-Lopez and Bixler-Zavala's drug habits contributed to the demise of the band. Commenting on the hiatus, guitarist Rodriguez said: "After a non-stop six-year cycle of record/tour/record/tour, we are going on an indefinite hiatus. We need time to rest up and re-evaluate, just to be human beings again and to decide when we feel like playing music again."  Cedric Bixler took responsibility for the breakup, saying repeatedly in interviews that he felt almost as if At the Drive-In was holding him back and that he didn't want his music to be confined to punk or hardcore -- that it should encompass many genres and be even more progressive, alternative, and "against-the-grain." Bixler-Zavala and Rodriguez-Lopez had stated that they wanted their next album to sound like Pink Floyd's The Piper at the Gates of Dawn, while the other members were intent on progressing in a more alternative rock direction.

were they popular?
at the peak of their popularity and following a world tour,