Do smart cars and Massachusetts drivers mix? State officials look to the future

How long will it be before self-driving cars hit Massachusetts streets? Does Massachusetts need to change its roads or repaint its lane markers? Should Massachusetts government invest money to grow the industry?  These were the types of questions posed Wednesday by two Massachusetts cabinet secretaries — Transportation Secretary Stephanie Pollack and Housing and Economic Development Secretary Jay Ash — to around 50 advocates and experts connected to the self-driving car industry.