Boston- An electronic road sign on Cambridge Street flashed “EXPECT DELAYS” and “ROAD WORK AHEAD” but also alerted drivers that “PORN IS GREAT.” It’s the second time such a message has appeared along the delay-plagued stretch of roadwork in Beacon Hill, but state officials aren’t laughing. “Obviously the message is unacceptable and will be taken down (Sunday) tonight,” said Jon Carlisle, spokesman for the state’s Executive Office of Transportation. He said while there are some electronic signs that can be hacked into remotely, someone broke through a locked panel to change the flashing message on this one. “That’s pretty clever,” said Chris Hickey, 27, of Boston while walking by the sign yesterday. But her friend, Andrew D’Agostino, said he would have aimed for something more original. “Of course it’s (porn) great, tell me something I don’t know,” he said.