Photo courtesy ThePennRelays.com

The nation’s oldest and largest track and field event, the Penn Relays, kicks off tomorrow at the University of Pennsylvania’s Franklin Field (233 S. 33rd St.) and there are a couple things West Philadelphia residents should know about the event.

First, traffic near Franklin Field will increase significantly as a result of the Relays, which run through Saturday. Penn security officials said 33rd Street from Walnut to South will be closed for about an hour on Saturday, from 6 p.m. to 7 p.m.

Those planning to attend the event, which attracts some 15,000 athletes ranging from high school students to Olympians, should expect much tighter security than in the past due to the recent bombings at the Boston Marathon. Security will be tight at every entrance to Franklin Field and everyone will be checked with metal detectors. Bomb-sniffing dogs and bomb disposal teams will also be on hand.

Here are the rules:

• Backpacks and large bags (gym bags etc.) will not be permitted into Franklin Field or the Relay Carnival Village.

• Participants (athletes, coaches, team medical personnel) will be permitted to bring in backpacks. These bags will be thoroughly checked and will only be allowed in via the designated participant entrances.

• All bags containing food must be smaller than 12x12x6 (inches) and in clear plastic bags. Sealed plastic water bottles and cardboard juice boxes are permitted inside the clear plastic bags.

• Coolers, glass bottles and cans will not be permitted.

For more info, including ticket information and schedule of events, go to the Penn Relays website.