Please enable JavaScript.
Coggle requires JavaScript to display documents.
traffic lights - Coggle Diagram
traffic lights
environment
location
busy places
cities
not on bends
on a road
where people need to cross
output functions
lights
time for crossing
disabled access output - safe crossing
buzzer for crossing
cost
inexpensive but safety is more important
production cost
installation costs
disruption to traffic during install
inputs
press button for pedestrians
sensor to detect cars
sensor to detect when pedestrians have crossed
components
buzzer
LEDs
microcontroller
aesthetics
easily seen from any direction
black body for contrast with lights
safety
safe to press - weather proof
timed correctly to make sure traffic stops before crossing
size
high lights for bridges
big enough to be seen