Ride-hailing apps for female drivers and passengers are not unique to Brazil. All-women ride hailing app See Jane Go launched in California in 2016, and rival Safr launched in Boston this year. Yet their rapid growth in cities such as Sao Paulo, Uber’s biggest market by rides, underscores rising concerns about public safety in Brazil and efforts to shield women from the discomfort and danger of a culture steeped in machismo.