The Metropolitan Manila Development Authority (MMDA) first implemented the Modified Uniform Truck Ban back in December 7, 2012. Its main purpose was to help alleviate traffic congestion in Manila's main thoroughfares during the holiday season and was scheduled to be lifted by January 6, 2013. But it proved to be so successful in improving the traffic situation in Metro Manila that they've decided to extend it for another six months.
The Metro Manila Council's (MMC) Special Traffic Committee (STC) issued Resolution No. 01 Series of 2013 which approves the extension of the ban from January 7 to July 6 of this year.
Under the modified truck ban, all trucks with a gross weight of 4,500 kilograms and above are not allowed to ply through EDSA (from Magallanes Interchange to North Avenue), 24 hours a day, 7 days a week. Elsewhere, the truck ban hours are now from 6:00AM to 10:00AM and 5:00PM to 10:00PM everyday, except Sundays and holidays.
Previously, the old truck ban policy of the MMDA allowed trucks to pass through EDSA from 9:00AM to 6:00PM.
Do care to note though that trucks carrying perishable goods such as agricultural products are still exempted from the modified truck ban.