Both red and silver Tesla Semi Prototypes have returned home after rigorous cold-weather testing in Canada starting in February as we reported last month, as the intensity of winter loosens a bit, Tesla brought the trucks back to the United States.

Multiple persons saw the Tesla Semi prototypes in Massachusetts and Washington states as they rested on large semi-trailer beds — interestingly they were super dirty suggesting the long journey they have been traveling to get back to the Tesla HQ.

Around two days before both of these trucks were spotted in the United States, they were seen crossing the Haines Junction in Yukon — a Canadian village around 1,632 km (1,014 miles) away from the state of Alaska, where these trucks probably crossed the border and entered the US — in the following pictures posted on Instagram by @ytranger, these trucks look clean, so this dirt was not from the testing itself.