Traffic — this longtime problem in Moscow, with its radial and circle street structure, has all but disappeared. There are several contributing factors. Self-driving cars always maintain a minimum distance, which guarantees no human error (car accidents, those infinite Moscow-style left turns from the right lane, zigzagging from one lane to another). The city center is free only for self-driving cars of the last generation — electric cars that can talk to each other and with road infrastructure (lights, congestion controllers, tunnels, and bridges). Older cars need to pay to enter the city center beyond main highways.