Heads up to any drivers planning to drive north across the Sunshine Skyway on Sunday morning: You can’t. The northbound lane of Florida’s tallest bridge will be closed to traffic from 4 a.m. to 10 a.m. for the running of the inaugural Sunshine Skyway 10k. The southbound lane on Interstate 275 will remain open to traffic, but it will not be converted for traffic to go both ways. So, once again, forget about going north for a few hours on Sunday. RACE COVERAGE: Skyway 10K organizers hope to make race an annual event More than 7,000 runners and walkers from 40 states and four countries have signed up to race over the bridge. The event is sold-out. The 6.2-mile race will benefit the Armed Forces Families Foundation, with 100 percent of proceeds going towards projects supporting military members and their families. The race will start just after 6 a.m. with the ceremonial firing of a howitzer on the southern foot of the bridge. RACE COVERAGE: Training for the Skyway 10K an uphill challenge The race will be broadcast locally between 6 and 7:30 a.m. on 10News WTSP. Spectators will not be allowed to watch on the bridge, but the race will be streamed live on a jumbotron that will be set up in Lot 7 at Tropicana Field. While fans watch runners and walkers tackle the grueling 4 percent grade of the bridge’s main span — a 4-foot rise for every 100 feet — they can enjoy the family friendly activities and live music at a free race expo that will be held at the Trop. That will mean a road closure outside the dome: Fourth Avenue S near Tropicana Field will not be available for public access between Dr. Martin Luther King Jr. Street S and 16th Street S from about 3 a.m. to 11 a.m. Traffic flow will be reversed so race participants can be bused out to the bridge. Race results will be available online at the race’s website, www.skyway10k.com.