What is the purpose of this notice?

In the event of a fire, employees are requested to move toward the exits in an orderly fashion. Employees are asked not to use the elevators. Do not run in the stairwells, and please try to avoid the temptation to panic. Upon exiting the building, employees are asked to assemble in the western car park, where the designated building safety employees will check to see if everybody has made it out of the building safely. When leaving the building, DO NOT try to take any possessions with you. This will only slow the rate of evacuation. Do not return to the building until the all clear is given.