The District of Columbia was first and their efforts have pioneered subsequent legislation locally and nationally.
Recently President Obama banned federal employees from texting while driving during working hours. The House of Representatives passed an order banning their staff members from texting while driving as well.
Congress is reviewing legislation to ban texting while driving and mandating that cellphone use while driving be accomplished using hands-free devices. Efforts are underway to restrict the use of cell-phones while driving for anyone under the age of 21.
The bottom-line, distracted driving causes deadly and injurious crashes in Maryland, the District of Columbia and nationwide. For More see: http://www.nytimes.com/2010/01/02/technology/02distracted.html?hp and http://www.maryland-law.com/library/nhtsa-shares-safety-data-concening-distracted-driving-car-crashes.cfm