According to the California Department of Motor Vehicles, as many as 400,000 new driver’s licenses may be issued following the orders contained in President Barack Obama’s ‘Deferred Action for Childhood Arrivals’ order. The order specifically allows formerly undocumented young people living in the U.S. at the behest of their parents to apply for citizens and entitles them to certain rights, such as driver’s licenses, immediately.

These individuals will still be required to provide all documentation required for ordinary citizens and pass all required exams and driving tests. That means they will need to demonstrate their driving ability and possess all the same skills as everyone else.

What is important to recognize is that an additional 400,000 drivers means, likely, hundreds of thousands of more vehicles on the roads in a state where traffic congestion is already a major concern. It is unclear how well the existing infrastructure and system can handle a major influx of new drivers and new vehicles, but it seems likely the State of California will find out sooner or later.

Deferred Action applies to undocumented immigrants between the ages of 15 and 31, who were brought to America before the age of 16 and have no criminal record. Participants also must be either high school students or graduates who have lived in the United States continuously for five years.

Gil Duran, spokesman for Gov. Jerry Brown, said the DMV statement reflects the governor’s position but that he could not elaborate.

The glitch is that state regulations allow only certain types of federal immigration documents to support the issuance of a driver’s license.

If President Obama’s Deferred Action program provides participants with “new or different immigration documents,” then legislation or regulatory clarification may be needed, the DMV said.