The Pennsylvania Turnpike has put out the follow on their official Twitter account:
As a COVID-19 safety measure, @PA_Turnpike will not accept cash/credit at ticket-system toll plazas starting tonight at 8 p.m. All tolls will be temporarily collected via E-ZPass or TOLL BY PLATE as vehicles travel at posted speeds through plazas.
Go to http://paturnpike.com for more.