The company is building on this through a new partnership with CVS, which will see its driverless vehicles deliver prescription medicines to customers in Texas within three hours of purchase.

Nuro has spent the last couple of years testing out various versions of its autonomous delivery vehicles through tightly monitored trials with Walmart, Domino's and supermarket retailer Kroger. The exemption it was awarded earlier this year was a significant one, because it was the first time US authorities have allowed testing on public roads of vehicles not at all designed to carry human passengers.