AUSTIN (KXAN) — An 18-wheeler that crashed around 6 a.m. Thursday morning blocked multiple lanes of northbound Interstate 35 through the heart of downtown Austin until shortly after 8 a.m.

Considerable fog also moved in just before the morning commute. A dense fog advisory was issued for Hays and Bastrop counties.

The 18-wheeler crash occurred near Riverside Drive just south of Lady Bird Lake. Only one lane of I-35 was open as of 7:30 a.m. Crews were diverting traffic around the crash to the frontage road at Exit 234. Cars were backed up all the way past Ben White Boulevard. There was a 30-minute delay from Slaughter Lane to downtown, but traffic has since starting flowing after crews cleared the crash.

Watch for live updates on KXAN Weather & Traffic, the morning show from 7 a.m. – 9 a.m. on the CW Austin. You can also watch the show on our live stream.