There's a new service available, but it shouldn't expect an easy ride. San Francisco is known as a tech metropolis. Uber and Lyft were founded there, which is surprising considering the city's low regard for rideshare services. Not that it's going to stop a new company, Alto, from trying its luck. Ahead of their 2022 San Francisco launch, Elaine Moore looks into how the city prioritises traditional taxi drivers leading to the comparative failures of other ride-hailing apps.