It has called on the government to set up an emergency capital highways maintenance fund, as it did following the floods which hit swathes of the country in summer 2007.
An emergency backup generator is only allowed to operate for 200 hours every year and only in the event of an emergency power failure or for routine testing and maintenance.
Therefore, full safe clearance is never done during the day (except in emergency repair situations), and nighttime is the only time all the major maintenance work can be completed.