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Lost control on the raining day!
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<blockquote data-quote="Schwepps" data-source="post: 165065" data-attributes="member: 3592"><p>Hi all, this has been a most informative thread on the whyfores of sliding into armco barriers <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> I'd like to add one more - reducing-radius curves. Highway on and off ramps should ideally be constant-radius curves, but in this country, for lack of space or some other reason, a lot of our ramps are reducing-radius, where the curve starts with a larger radius than it ends.</p><p></p><p>This is all the more lethal when it's downsloping, has little or no positive camber, and is wet. Getting off a highway doing 110kmh (or more) and going into a curve just lifting off the gas, it feels like the car will hold it easily. So you're in a BM with DSC, and you don't want to look like a sissy (especially if there's someone nice sitting beside you) So you sheepishly step on the gas again. You don't realise the curve is going to get tighter and tighter, and you should actually be slowing down instead of holding speed or even accelerating. Screeeeech! Whammm!</p><p></p><p>The most famous reducing-radius curve that I know is the exit from Damansara Heights on Semantan into a 270 onto Duta, city-bound. The armco was replaced years ago with concrete. A positive camber was introduced where it used to be neutral. But our innovative engineers also decided to replace tarmac with interlocking pavers which are okay in the dry, but lethal in the wet. The concrete barriers have seen the bumpers and other body parts of hundreds of cars over the years. There's a fresh mark, or several, every Monday morning after the weekend's late night macho dashes into town from a Bangsar or Hartamas watering hole. I always look for them and find them easily every Monday morning <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>Unfortunately the eye can't tell you that a curve is reducing-radius and only experience of that particular curve can. My advice is, be aware that highway building and approval standards are not exactly consistent in this country (refer MRR2, new Kuantan Highway, etc, etc.) Don't think that all highway ramps are consistently well-engineered and well-built. Be extra cautious on 270 degree on and off ramps going downhill, unless you know them well.</p><p></p><p>My 2 sen, KL2DC <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Schwepps, post: 165065, member: 3592"] Hi all, this has been a most informative thread on the whyfores of sliding into armco barriers :-) I'd like to add one more - reducing-radius curves. Highway on and off ramps should ideally be constant-radius curves, but in this country, for lack of space or some other reason, a lot of our ramps are reducing-radius, where the curve starts with a larger radius than it ends. This is all the more lethal when it's downsloping, has little or no positive camber, and is wet. Getting off a highway doing 110kmh (or more) and going into a curve just lifting off the gas, it feels like the car will hold it easily. So you're in a BM with DSC, and you don't want to look like a sissy (especially if there's someone nice sitting beside you) So you sheepishly step on the gas again. You don't realise the curve is going to get tighter and tighter, and you should actually be slowing down instead of holding speed or even accelerating. Screeeeech! Whammm! The most famous reducing-radius curve that I know is the exit from Damansara Heights on Semantan into a 270 onto Duta, city-bound. The armco was replaced years ago with concrete. A positive camber was introduced where it used to be neutral. But our innovative engineers also decided to replace tarmac with interlocking pavers which are okay in the dry, but lethal in the wet. The concrete barriers have seen the bumpers and other body parts of hundreds of cars over the years. There's a fresh mark, or several, every Monday morning after the weekend's late night macho dashes into town from a Bangsar or Hartamas watering hole. I always look for them and find them easily every Monday morning :-) Unfortunately the eye can't tell you that a curve is reducing-radius and only experience of that particular curve can. My advice is, be aware that highway building and approval standards are not exactly consistent in this country (refer MRR2, new Kuantan Highway, etc, etc.) Don't think that all highway ramps are consistently well-engineered and well-built. Be extra cautious on 270 degree on and off ramps going downhill, unless you know them well. My 2 sen, KL2DC :-) [/QUOTE]
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