Runways are named for their magnetic heading, to the nearest ten degrees; hence the runways at 14° from magnetic north are 01L/01R, and the runways at 284° are 28R/28L. The layout of the parallel runways (1L/1R and 28R/28L) was established in the 1950s, and have a separation (centerline to centerline) of only 750 feet .