There is no mention of increasing VED, it's money the Tories have reserved for road building while Labour said they would use it to lower train fares:
Labour say these changes would cost about £1.5bn per year. The funding would come from a wider change planned by the party to create a sustainable transport fund from the revenues bought in by vehicle excise duty, or VED, which is based on emissions.
While income from a particular tax is not normally reserved by the government for use in a certain way, known as hypothecation, under an existing Conservative plan, from 2020 this would happen for VED, with the income reserved for road building and maintenance projects. VED is due to raise £6.5bn in the 2019-20 financial year, according to the Office for Budget Responsibility.