This sprawling metropolis of honking cars and 22 million harried people has been brought to its knees, not by an earthquake or its smoking volcanoes, but rather a small contingent of angry school teachers.

Some 10,000 educators protesting a government reform program have in the span of a week disrupted international air travel, forced the cancellation of two major soccer matches, rerouted the planned route of a marathon and snarled already traffic-choked freeways.

The disruptions have shown how little it takes to push a city that is snarled on a good day over the edge.

Taxi drivers are so desperate they are refusing fares to certain frequently blocked parts of the city, and residents have turned to urban survival skills — driving the wrong way down streets, using rental bikes, clambering over fences and piling into the back of police pickups to get to their destinations.

The city even launched an app on Tuesday that warns drivers of protest locations, with a little orange icon of what appears to be a city resident climbing a mountain marking each blockade or march.

“It’s terrible. There’s no business … people don’t even want to get into a cab, because the traffic isn’t going anywhere,” taxi driver Ernesto Gallegos said Wednesday, standing beside his parked cab on the curb of the city’s main boulevard.

“People will get out and say, ‘I’ll walk instead.’ They’ll get on these eco-bikes,” he said, referring to the city’s bike-sharing program.

Cesar Juarez, 30, who works repairing wireless systems for a telecom company, sat in his car at an intersection blocked by protesters, shooting photos with his cellphone to show his boss why he couldn’t reach a client. Others stuck in frozen traffic near the protests busily dialed in to postpone meetings.

“I’ve had to cancel two appointments so far today,” fumed bank employee Arturo Gutierrez, 47, rapidly texting away on his Blackberry. “That’s lost economic activity.”

“I just told my wife: ‘Let’s go live in the countryside. What are we doing here?’”

The cause of this upheaval is a government reform program that would subject teachers to periodic evaluations in the form of standardized tests, and end the unions’ power over hiring. That would be a jolt to an education system in which some teachers can actually inherit their jobs from their parents.

Juan Melchor Roman, one of the leaders of the striking teachers, said the union was aware of the growing anger among city residents.

“But we think that is being whipped up by the news media,” he said. “We are asking the public to understand the teachers’ struggle … and understand us a little.”

The union says a standardized test is an unfair way to evaluate a teacher’s entire career, and argues that parents and student evaluations and other factors should be taken into account. The government counters that teachers will have multiple chances to pass the test, and says failing teachers won’t be fired, but reassigned outside the classroom.

But those arguments were hardly the first thing on the minds of the suffering masses trying to make it through the day in Mexico City.

City police have taken to routing traffic the wrong way down one-way streets — something the government calls “reversing” streets. The country’s first-division soccer league announced it was canceling two Mexico City matches because the police it would normally assign to keep the peace were too busy managing the protests.

And the situation looks like it may actually get worse.

On Saturday, the striking teachers plan to join other protesters in a giant march against the government’s proposed oil industry overhaul, leading to fears that some demonstrators might resort to breaking windows and trashing stores, an unfortunate tradition in some past marches.