Traffic accidents happen a lot here.
There's heavy traffic on the street in front of the building the Tofugu office is in.
I wish my car had helicopter blades so I could fly over this traffic jam.
When things get all mixed up while trying to pass through each other it becomes a mess. This can be people, cars, bikes, what have you. Anything that has to move around and pass through each other. When this happens things slow down and you get traffic.
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.