Tesla has inched ahead of General Motors to become the most valuable car company in America. The electric-car maker hit a market value of $50.84 billion on Monday, edging past GM () at $50.79 billion. It's another milestone for Tesla (), which passed Ford (), valued at about $45 billion, last week. And Tesla is inching closer to Japan's Honda (), which has a market value of about $54 billion. Toyota, the most valuable car company in the world, is three times as big.