Google has built its first self-driving car prototypes and hopes to test hundreds more models this summer. If all goes well, the company is planning a pilot program in California over the next few years.

“The Challenge!” Young boy relishes in a game of tug of war before school. Photo location: Lake Titicaca, Peru. (Photo and caption by Paul Heyman/National Geographic Photo Contest)

A resident douses passengers riding in a public motorcycle cab with water, during St. John the Baptist Feast Day celebrations in San Juan city, metro Manila June 24, 2014. Residents participate in an annual city-wide waterfest in honour of their patron Saint John the Baptist. (Photo by Romeo Ranoco/Reuters)

A dog known as “Menswear Dog”, a 5-year-old Shiba Inu, poses for photos during the 24th Annual Tompkins Square Halloween Dog Parade in New York October 25, 2014. Hundreds of dog owners dress their dogs and compete for fun and prizes during the parade. (Photo by Carlo Allegri/Reuters)

A 210-kilogram-weight Epinephelussp was showed at China Fisheries & Seafood Expo in Fuzhou, Fujian, China on 24th October, 2014. (Photo by Top Photo/Sipa Press USA)

German KUKA Robotics' robot LBR iiwa demonstrates a flower arrangement at the International Robot exhibition in Tokyo, Wednesday, December 2, 2015. (Photo by Shizuo Kambayashi/AP Photo)

A staff member (R) looks on next to a cake, which was baked in the shape of a muscular man, for customers to try for free during a promotional event of a cake store in Shenyang, Liaoning province, China, December 6, 2015. (Photo by Reuters/Stringer)

A villager run as Mount Sinabung erupt at Sigarang-Garang village in Karo district, Indonesia's North Sumatra province, February 1, 2014. Four people died and more than 28, 000 villagers have been evacuated since authorities raised the alert status for the volcano to the highest level in November 2013, local media reported on Saturday. (Photo by Reuters/Stringer)