Regional Transport Authority officials never had it so tough. While they have managed to stop all private and government vehicles from displaying advertisements, they've found the Bangalore Metropolitan Transport Corporation (BMTC) a tough nut to crack. They're armed with an Act of law, a high court ruling and a Road Safety Authority (RSA) decision which prohibits display of ads on vehicles as these could distract other drivers. However BMTC buses, especially the Volvos, continue to display huge ads. What's worse, government ads with large photographs of chief minister B S Yeddyurappa and transport minister R Ashoka are on almost all buses plying towards IT corridor areas like Whitefield and Electronic City. Interestingly, BMTC managing director Syed Zameer Pasha says he's unaware of this blatant flouting of rules.