There are different areas in the Glass City in Mirror’s Edge Catalyst and the only modes of transport are running and fast travel, the latter of which has to be unlocked first in order to use it. This Mirror’s Edge Catalyst: How to Unlock Fast Travel guide will show how to unlock fast travel.
How to Unlock Fast Travel
The player needs to get a Gridnode Side Mission. Completing one will automatically unlock the subsequent Gridnode Side Mission. The Gridnode Missions are platform puzzles and the player needs to find a way to the circuit board laden complex to unlock the CCU. Laser beams will block the way so a certain degree of skill is required.
Once the player has hacked all the Gridnodes, fast travel to any safe house will be available. For getting the ‘Undetected Surge’ achievement, the player needs to finish all Gridnode Side Missions without being detected by the laser beams even once.
You may also like to read Mirror’s Edge Catalyst’s Achievements List