China’s self-driving car revolution is already gathering speed at home. Now the country’s leading autonomous car makers are spreading abroad. Take Guangzhou-based WeRide. Its robobuses ferried passengers between event venues at the French Open tennis in Paris in May, and carried VIPs attending a major international investment forum in Riyadh last October. By the end of this year, its robosweepers will be cleaning the streets of Singapore around the clock.  A WeRide robob