Tesla is expanding its Full Self-Driving beta as it looks to ramp up the development of the advanced driver-assistance system.

The electric car manufacturer introduced the Full Self-Driving beta in October to select owners participating in its Early Access Program. In total, there have been about 1,000 vehicles participating in the beta and despite what the name of the system may suggest, drivers are expected to keep their hands on the steering wheel at all times.

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Taking to Twitter late last week, Elon Musk said the company is doubling the size of the beta program with its latest software release and will grow the beta in size by 10 times with a further update. Musk added that due to high levels of demand for the system, the car manufacturer will add a ‘Download Beta’ button to the Service section of its vehicle displays in approximately 10 days.

“Still be careful, but it’s getting mature,” Musk added in his tweet. He also explained that the term ‘beta’ is used by Tesla “to reduce complacency in usage and set expectations appropriately. All software is first tested by Tesla simulation and QA drive teams.”

Musk also confirmed that the availability of the Full Self-Driving beta will vary by region due to regulatory approval delays and Tesla’s internal development and testing.

Those wanting to get access to the beta can send an email to earlyaccess@tesla.com, the service the carmaker uses to coordinate the program.