Tesla Inc. (TSLA) - Get Report is developing a long-haul, electric semi-truck with autonomous driving capabilities that move in "platoons" and automatically follow the direction of a lead vehicle, Reuters reports.

The electric carmaker is said to be nearing the completion of a prototype of the trucks, according to an email obtained by Reuters between Tesla and the Nevada Department of Motor Vehicles.

Furthermore, officials from California will meet on Wednesday to "talk about Tesla's efforts with autonomous trucks," state DMV spokeswoman Jessica Gonzalez told Reuters.

Shares of Tesla were higher in after-hours trading on Wednesday.

One person that probably isn't feeling this news is billionaire Warren Buffett.

"Autonomous vehicles would hurt us if they spread to trucks," Buffett told shareholders at Berkshire Hathaway's (BRK.A) - Get Reportannual meeting in May. If self-driving trucks become predominant on the roads, it could steal business from Berkshire owned railroad Burlington Northern, Buffett hinted.

Buffett acknowledged that autonomous cars are "coming", and could also "hurt" Berkshire's insurance business Geico. After all, driving hands free is much riskier than driving with two hands on the wheel.

To be sure, Buffett is right that autonomous cars are on the way.

By 2035, more than 12 million fully autonomous vehicles are expected to be sold per year globally, according to research firm BCG.

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