From the publisher's website:
Whether you're on the run or in hot pursuit, Chase Cards make hectic sprints about more than just movement speeds. This beautifully illustrated deck of 51 full-color cards gives you a new way to run chases and races in your Pathfinder Roleplaying Game adventures. Each card presents an obstacle in one of three classic adventure settings - a bustling city, a tangled forest, or a deadly dungeon - challenging heroes to overcome or fall behind. Get in the race with Chase Cards and don’t get left in the dust.
By laying a line of these cards down on your table, you can track each character's progress through a path fraught with perils - along with all of the die rolls needed to avoid or navigate these unexpected dangers. Lay out a desperate pursuit through a crowded city, a dangerous race through hostile wilderness, and a nerve-wracking run through deadly ruins and abandoned buildings - or mix and match the cards to create a chase that moves through multiple regions!