Here's one of the 4 toll booths that service this plaza. Strange little thing to happen to a road, really. But it's been done in India for the last 15 years, at least. So, that's cool.
It costs you INR 40 to cross through once in a car. For those of you catching taxis to and/or from Mahab, check to see if the toll amount is included in the fare. It costs between INR 800 or 900 one way from Chennai to Mahabalipuram...toll not included.