Thirteen years after Maryland embarked on a nationally recognized effort to promote Smart Growth, the state's laws and policies have had little discernible impact on sprawl or traffic congestion, a new study says, and farms and forests are still threatened by development.

Jon Laria, a Ballard Spahr real estate lawyer who is chairman of the state's growth commission, said he hoped that state and local laws and regulations could be revised to discourage sprawl. He said town, county, and state officials must work together to change how Maryland is growing, and put away long-running frictions over which level of government has the last say on development. "The Chesapeake Bay does not care what jurisdiction it's in," he said.