. >> but james sweeney, a aiw=std university expert on energy policy questions the use of public dollars to help build hydrogen stations. >> the state wants to build hydrogen fueling infrastructure with no knowledge as to whether there's going to be a significant number of vehicles# that will use those. it's a recipe for risking taxpayer funds for what may be a total waste of money. >> this isn't the first time california has tried to promote a vision of a hydrogen highway. >> all across our highway system, hundreds of hydrogen fueling stations will are built. >> arnold schwarzenegger's plan relied on private investors to build up to 100 stations by 2010, but the plan failed. >> i think the original plan timing was ambitious and i think that the cars really have come so far since the 2004 plan was established. >> even so, will drivers can choose hydrogen when electric cars and other clean vehicles are already on the road? >> really drives just like in he other car. gas pedal and a brake. there's an emergency brake if you need it. >> have fun. >> when people get to test drives the cars, t