Howard Street between 3rd and 4th Street was shut down Tuesday ahead of next week's kickoff of Salesforce's annual Dreamforce convention. And for everyone who doesn't know the drill, this means it is officially time to avoid driving anywhere near SoMa for the next two weeks.

And guess who the keynote speaker is this year! It's Barack Obama.

The already trafficky SoMa environs become a Class A, rage-inducing shitshow this time of year as the setup for Dreamforce begins. And the convention hasn't even started yet. Expect to be dealing with cascading, intractable traffic misery for many blocks around the Moscone Center from now until Monday November 25, when the convention tents have been removed and Howard Street reopens.

Things of course get worse next week when 100,000 or so conventioneers arrive to further clog the streets, from November 19 to 22. But the road closure extends through Sunday, November 24, and it has already begun so that the event area construction can begin.

And do note that The Black Keys and Cher are both putting on shows at the nearby Chase Center next week, in the middle of Dreamforce.

It is not yet clear which day Obama will be arriving, and what the added impacts of his Secret Service caravan will be. In past years, we know Barack has preferred the InterContinental Hotel on Howard and 5th, but who know where he may choose or if he's even spending the night in the city.

As ABC 7 reports, about eight different bus lines and their various express routes will be affected by the convention. Those are: the 8-Bayshore, 8AX Bayshore A Express, 8BX Bayshore B Express, 10-Townsend, 12-Folsom; 14-Mission; 14R Mission Rapid, 14X Mission Express, 30-Stockton, 45-Union/Stockton, 81X Caltrain Express, and 82X Levi Plaza Express.

Also featured at this year's Dreamforce, for which tickets are upwards of $1,000: Tim Cook, Women's World Cup star Megan Rapinoe, and local cookbook author turned Netflix personality Samin Nosrat.

Photo: Conner Forrest/Twitter