It seems like the postponed Tesla Model X is nearing its official unveil date with heavy steps, as a pre-production prototype was recently caught driving on a Californian highway. The lightly disguised vehicle was spotted near Palo Alto, where Tesla Motors' headquarters are located, and this is the first time that a Model X prototype has been filmed on a public road.

Previewed by a concept car in early 2012, Tesla's->ke1842 first crossover was supposed to start production by the end of 2013, but it was rescheduled several times. The latest delivery estimates for new reservations are "early 2016," meaning the the Model X could be unveiled as early as the 2015 Frankfurt Motor Show,->ke235 in September. Tesla may even surprise everyone by bringing it to the upcoming 2015 New York Auto Show,->ke226 although it is less likely.

Based on a modified Model S architecture, the Model X crossover will feature normal doors at the front and so-called "falcon wing doors" for the rear passengers, while the rear luggage compartment will feature a regular hatch. Available as standard with the dual motor and all-wheel drive system from the Model S P85D, Tesla's crossover will also feature a choice of multiple battery and performance options, while its interior should be at least as accommodating as on the Model S. As seen in the short video->ke278 above, the overall look is that of a more bulbuous Model S->ke3329.

2016 Tesla Model X

Read our full review here.