Mohammed bin Rashid Al Maktoum

Dubai pushes the pedal to the metal on driverless cars

Already home to the world's biggest skyscraper, Dubai has another tall order to fill: By 2030, its leader wants 25 percent of all trips on its roads to be done by driverless vehicles.

Monday's announcement by Sheikh Mohammed bin Rashid Al Maktoum came without warning and with few details, as is sometimes the case with the many aspirations of the leadership of the United Arab Emirates.

In this car-crazed city-state of over 1.5 million registered vehicles, it's not unusual to see Ferraris idling alongside Lamborghinis at traffic lights. And Dubai already is home to a driverless Metro rail system, which carried 178 million riders in 2015.

Smart-car technology is being...