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Pavement distress along C-5 due to the truck lane policy

I frequently use Circumferential Road 5 (C-5), which is known by many names according to the MMDA, the DPWH and the LGUs it passes through. One thing I always notice is the deteriorating or deteriorated pavement, particularly along the lane designated for use by trucks. The MMDA had instituted and implements a policy requiring large trucks to use one lane of C-5 during times when the truck ban is lifted (10:00 AM to 4:00 PM). Smaller trucks are allowed to use other lanes.

The result has been a long platoon of large trucks along the designated lane of C-5 and this concentration of load on the highway has caused faster pavement deterioration for that lane. This is especially evident when the pavement surface is of asphalt concrete. Flexible as it is, the concentration of load has led to obvious pavement deformation as shown in the following photo.

For Portland cement Concrete pavement (PCCP) cases, I would presume that there is also significant damage and the distresses (e.g., cracks) can be linked to this concentration of load. This situation and the conditions for loading likely have detrimental implications on maintenance costs for C-5 and is probably an unintended consequence of the MMDA’s policy. It would be interesting to quantify the impacts of this truck lane policy, whether it has contributed to improve traffic flow along the major thoroughfare, and whether the maintenance costs have risen (and by how much) from the time the policy was implemented.