Security checkpoints along the Pennsylvania Avenue parade route were running smoothly early Monday, but officials said the greatest crush was expected after the noontime ceremony on Capitol Hill.

Authorities set up 12 screening sites along the route, and most visitors were clearing the checkpoints in a matter of minutes. At the checkpoint at 12th and F streets, the line for metal detectors stretched less than a half-block.

But at the nearby John A. Wilson Building, the headquarters of the District's government and the site of a heated reviewing stand for top city leaders and their guests, security was especially tight.

To get access to the $342,000 reviewing stand (paid for with federal money), guests had to pass through three separate checkpoints. Guests who attended past inaugural festivities at the Wilson Building said security for the 2013 rendition appeared more intense than in past years.

Security checkpoints are expected to see a crush of people between the 12:30 p.m. end of the inaugural ceremonies and the 2:30 p.m. start of the parade.