The 13-letter word you're looking for is "traffic signal." It refers to the system of lights used to control vehicle and pedestrian traffic, where the green light indicates that it's safe to proceed.
encouragement
eavesdropping
paraphernalia
circumference
Perpendicular
equally likely
possibly 'concentration'
procrastinate
Dictator
13 letter word for sharing ideas
Drag: to move very slowly. Procrastinate.
contaminating