The ban of heavy vehicles from our 2 main roads (Persiaran Kewajipan & Persiaran Tujuan) during morning and evening hour was first mooted in 2010. Here's a link on what I've written on the subject back then:
http://www.rajiv4malaysia.com/2010/07/ban-of-heavy-vehicles-during-peak-hours.html

This matter was deliberated for a good few months, before the council approved the matter in December 2010. Since then, and after the necessary procedures to gazette the move, the ban has come into force.

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(as reported by Selangor Times)


Peak hour heavy vehicles ban

Published: Fri, 21 Sep 2012
SUBANG JAYA: In a move to ease traffic congestion, vehicles weighing more than 10 tonnes are banned from Persiaran Tujuan and Persiaran Kewajipan during peak hours starting  from Sept 20.
Subang Jaya Municipal Council (MPSJ) deputy president Abdullah Marjunid told reporters heavy vehicles such as tankers are no longer allowed on the two roads between 6.30am and 9.30am and from 4.30pm to 7.30pm.
“We’ll give logistics companies and lorry drivers a buffer period of one month to adapt and reschedule their journeys,” said Abdullah at a press conference.
He said traffic police, the Road Transport Department and MPSJ enforcement officers will start to issue summonses of up to RM300 to errant drivers after the buffer period.
Abdullah said the council has set up 20 notice boards along the two main roads to inform lorry and truck drivers about the peak hour ban.
Section 70(2) of the Road Transport Act 1987 allows enforcement authorities to prohibit or restrict the use of specified roads by vehicles of any specified class during particular hours.