system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Do Map apps add stop signs and red lights into travel time? If so how?
gpt
For each segment, the road between two places you could turn, there is an "average travel time".  This ATT parameter includes the time spent at a stop sign and the average time spent at a traffic signal (it's plus 0 if the light is green and x if you have to slow down, wait, and go again).  When their is traffic, a "traffic penalty time" is added to ATT.  Minimization of ATT is the benefit function used to select a route.