How do aisle lights show the direction to exits? Lights in the aisle will guide you towards an exit.


I've sat through a lot of safety briefings (for commercial scheduled passenger flights) and always found this sentence especially uninformative. Usually the cabin crew pantomime will include some vague gestures towards the floor of the aisles at this point, but even with airlines that use pre-produced videos for their briefings it seems that the video never actually shows those guiding lights in action.

Are they moving dots of light in the floor that chase towards the nearest exit row? Are they fixed lights that are shaped like arrows, pointing to the exits? Or just a strip of light that will tell me, "here is the aisle", but I'll need to figure out by myself which way along it to crawl?
The Floor Proximity Emergency Escape Path marking requirements (for transport category aircraft certified under FAR Part 25) have to meet the specific requirements as noted in the regulatory excerpt below.  There are different configurations that may be used to satisfy the regulations.
FAR §25.812   Emergency lighting. (excerpt):

(...) In the dark of the night, the floor proximity emergency escape path marking must enable each passenger to—
(1) After leaving the passenger seat, visually identify the emergency escape path along the cabin aisle floor to the first exits or pair of exits forward and aft of the seat; and
(2) Readily identify each exit from the emergency escape path by reference only to markings and visual features not more than 4 feet above the cabin floor.

Here is a sample from the Flight Safety Foundation showing an example of floor proximity escape path markings.

(Source)
Also, here is a link to a Flight Safety Foundation article regarding floor proximity lighting.