Take you time - Lynnwood bridge security is aware of the cache.
An emergency exit is a special exit for emergencies such as a fire: the combined use of regular and special exits allows for faster evacuation, while it also provides an alternative if the route to the regular exit is blocked by fire, etc.
This particular exit (as well as another one) is opened during emergencies or fire drills at the Lynnwood Bridge Complex to evacuate staff to the lovely park next door. Take care on how this path is always is kept clean at all times as well as lights to highlight the path during night.
Note that Lynnwood bridge is close from 00:00 to 06:00