Many prefecture or autonomous communities are trying to do what they can do for environment. Since several years ago, trash separation has been started.
For example, Pet bottle, cans & jar, plastic material and food waste need to be trashed separately. The garbage truck comes for trash but they pick up set trash.
For example, Monday:food waste, Tuesday:plastic material, Wednesday:cans & jars, Thursday:food waste, Friday:Pet bottle.
As it is rule for community, people observe the rule even it is a bit troublesome.