Letters
by J.Y.
I am a frequent user of our North-South Expressway and I have this
IMPORTANT experience to highlight and share:-
I was driving back to Penang yesterday afternoon (24 June 08) when I saw
the unfortunate accident in the opposite direction involving the passenger
bus that skidded and overturned at Tanjung Malim. I didn’t know that the
skidded bus was from hometown Penang untill I watched TV3 news later in the
evening and was shocked to learn that the accident took two lives.
Now, this is what I need to share:-
I am a building contractor with over twenty years of experience and I have
been driving my 5 series BMW (latest generation and a dammed solid road
holding car) each time I travelled to KL. Lately, the new extended 3 lanes
highway had been opened up for use and since then, I have also been using
it quite oftenly.
HOWEVER, when I used it each time it is WET, I can really ‘feel’ that the new road surface is extremely SLIPPERY! To share with some of you, my car comes with a built-in traction control mechanism (skidding prevention mechanism) and you can feel it each time it is activated. Previously, I don’t come across this kind of slippery feel except when I drive over a
paddle of water at certain speed.
From my observation as a building contractor, the ‘wearing course’ of the new road surface could be TOO FINE OR TOO SMOOTH and TOTALLY UNSUITABLE for highway use!
The wearing course (top premix layer) mix design for highways should be of minimum 20mm coarse aggregate mix that will give us the required bond between the surface and our tyres. Fine wearing course (14mm coarse aggregate size and below) is only suitable for normal road. (A proper test need to be carried out to determine the mix design of the wearing course).
Since the opening of the three lanes highway, I had seen cars skidding in front me or in the opposite direction and approximately 2 weeks ago, one of my friends who is also a frequent user of our NSE, came to share with me about his slippery feeling as well as the many skidded cars he had seen lately.
I am highlighting this to TV3 and The Star with the hope that a thorough investigation could be carried out immediately to find out how or what causes the bus to skid. A proper and independent test need to be carried out urgently to determine the design mix of the wearing course. THIS CAN SAVE LIVES.