They say almost no one comes to the area anymore as the alternative route is too difficult and inconvenient.
Many who live near the SUKE highway construction site say they were opposed to the project from the start.
The Department of Occupational Safety and Health says further legal action will be taken based on the results of the probe.
So many incidents happening in such a short period of time should be a sign to the authorities that something is not right.
More than 30 hours has passed since the incident in which a launcher crane collapsed, killing three and injuring another.