PORTLAND, Maine — A toll increase approved Thursday by the Maine Turnpike Authority’s board raises cash tolls from 50 cents to a dollar at four toll ­plazas and raises by 40 percent the cash cost of driving the full length of the 109-mile highway.

The plan, unanimously ­approved, increases cash tolls by $1 at the York plaza and 50 cents at toll ­plazas in Wells, West Gardiner, and New ­Gloucester.

Under the new rates, the cost of traveling the ­entire turnpike from York to Augusta will increase from $5 to $7 for cash-paying motorists.

Maine E-ZPass rates will ­increase 1 cent per mile.

The rate increase, effective Nov. 1, will bring in an additional $21.1 million in annual revenue, helping to cover the turnpike’s operating budget, maintenance, and long-term debt service.