Final design decisions

• We drop the red color in favour of encouraging rather then deter. Yellow & green will be used instead.
• The zones remain for sensory reasons but as output we're gonna use arrows instead.
• We're gonna use waves-patterns to encourage movement and making sure the system is noticed.
• System is only active when the train is at a station. When the cart moves, the lights fades out.
• Even in extreme rush hour, one place in the cart will be the worst. Therefore the system should calculate relative crowdness for the zones.