regulations on overtime work will be tightened in the construction industry from April. Approximately 10% of construction-related subcontractors' average overtime hours exceed the new upper limit.

One of the causes of overtime is the time required to travel from the meeting place to the construction site. Large cranes are indispensable for the development of high-rise buildings and tower condominiums in central Tokyo, but it is difficult to leave them on site at night, and in many cases they are moved to storage locations.