"We study the road network really closely to make sure we understand the variety of things that can come up on any given day," she said. "Detroit happens to be an extremely complicated route with a lot of variables."
She added, "We are looking at identifying routes where the fleet attendant will be taken out -- with a focus on safety and reliability -- next year."
Malek declined to give details on other cities where May Mobility might expand. But she said the company is likely to expand its Detroit service with new partners, and will focus on opening in more U.S. cities before expanding internationally.
To pursue new business models, Malek said the company must expand its vehicle fleet.
"I think we're at the point in the industry where we have to sit back and ask, 'Do people want a better car? Or do they want a better mobility solution?' If we think about it from that context, we'll make much better decisions in how we help people get around."