Starting Saturday, Santa Clara Valley Transportation Authority increased bus services along 20 of its most popular bus routes.
A new light rail line was also unveiled.
Officials have been working on these changes for three years.
"We were getting ready for the new BART service to come into Milpitas and North San Jose area, and we knew that was a great opportunity to really look at the service and see where we might make our biggest gains in ridership," said Brandi Childress, Santa Clara Valley Transportation.
VTA employees are changing signs at 3,300 bus stops.