The trials, which rely on sensors that allow the cars to detect traffic, pedestrians and signals, took place in Coventry city centre over several weeks.
Jaguar said a human was on board to react to emergencies.
The government said the industry would be worth £28bn to the UK economy by 2035 and will support 27,000 jobs.
Labour quipped that under the Tories it would not only be the cars with no-one in the driving seat.
‘Long way off’
Critics have warned the technology necessary for driverless cars to succeed is a long way from being ready.
Former Top Gear host and now Grand Tour presenter Jeremy Clarkson said he was recently in a self-driving car which made two mistakes which could have killed him in just 50miles.
Writing in the Sunday Times magazine, Mr Clarkson said the incidents convinced him the technology was still “a very long way off”, adding: “For now, we’re miles away from it.”
In the Budget, Mr Hammond is also expected to announce:
£75m for artificial intelligence
£400m for electric car charge points
£100m to boost clean car purchases
£160m for next-generation 5G mobile networks across the UK
£100m for an additional 8,000 fully-qualified computer science teachers supported by a new National Centre for Computing
A retraining partnership between the TUC (Trade Union Congress), CBI (Confederation of British Industry) and the government
£76m to boost digital and construction skills
Funding for 5G technology will go towards the National Cyber Security Centre to ensure the security of the mobile network, as well as testing on roads to help provide the network needed for driverless cars.
A further £35m will be used to give rail passengers reliable mobile connections and “lightning-speed” internet during journeys. Trials are due to begin on the Trans-Pennine route, which connects Leeds, Manchester and Liverpool.
Labour shadow chancellor John McDonnell said the Budget needed to show a “genuine, decisive change of course” and not “empty promises”.