Road for electric car makers full of potholes

On an overcast Friday in February, about 100 people gathered behind Tesla Motors Inc. headquarters, awaiting the future of transportation. A truck pulled up with a trailer, which disgorged a sleek black electric sports car that promises to change the world as much as the Model T did a century ago. The crowd toasted with champagne as Elon Musk, Tesla's chairman, climbed a staircase and made a triumphant speech. "This is the culmination of an enormous amount of work," he said.