In aviation it is customary that runways are named based on their magnetic heading. Every runway has two magnetic headings (named directions), looking from each end to the other one. William P. Hobby Airport has 4 runways with directions: 4/22, 12L/30R, 12R/30L and 17/35.
On some airports there are special signs “L” or “R”. They mean, respectively, the runway on the left or right side, looking in the direction of the runway’s magnetic heading. For runway on water ther is special sign “W”.
Disclaimer: Our articles and data connected to runway direction of William P. Hobby Airport are based on public data from various sources. We are very picky to select an reliable data providers, but we cannot guarantee that everything is 100% error-proof. We recommend for any serious purpose - as a rule of thumb - to request offical data about runway direction from manufacturer of William P. Hobby Airport.