Even in the case of the lorry in the now infamous blue deliberately knocking down cyclist in the vicinity of Pasir Ris Road on 22 December 2018 https://www.straitstimes.com/singapore/transport/lorry-driver-cyclist-arrested-after-pasir-ris-road-altercation where the a screen shot of the lorry attempting to overtake shows the dire danger of having cyclist (especially convoy cyclist) sharing the same lane as vehicular traffic:
Many who argue that the cyclist in question should have kept left and simply cycled in single file have probably never cycled on the road before, much less in convoy formation.
The two lanes afford all motorist with the ample and safe opportunity to filter to the right most lane and overtake the convoy before filtering left again, depending on the amount of space there is ahead of the cyclist convoy.
Already, from the Yahoo news video screenshot, there is very little space (much less than standard overtaking clearence of 1.5 metres afforded between cyclist in single file and the overtaking vehicle concerned.
During even heavier traffic, motor vehicles may end up sharing the same lane as cyclist rather than executing a safe and decisive overtake maneuver whilst somewhat sharing the same lane over a prolonged distance, this will be the likely scenario if cyclist were forced into single file riding formation by road bullies or unwise government legislature.
The problem occurs when motorist on the 2nd most left lane refuse to allow vehicles on their left to filter right to overtake the cyclist, but expect the cyclist to squeeze to the side to give way instead. Whilst this option may theoretically possible for motorcycles and really tiny and small cars overtaking single file cyclist, this is most unsatisfactory as the line of cyclist extends longer since this results in the overtaking maneuver becoming more like lane sharing instead, which the left lane is too narrow to permit in Singapore now.
Lane sharing with a lorry the size of the one in the Pasir Ris incident is a very dangerous proposition, much less sharing with the likes of trailers, public buses, which themselves take up almost the entire lane. Lane sharing between motorist and cyclists is a very hazardous form of road use, not worth the risk at all involved.
The safe road sharing procedure is for the large vehicle to overtake by filtering to the right lane and motorist ought to expect them to do so, rather than expect the cyclist to give way.
Heavy trailers and public buses are also likely to provide more than the usual 1.5m side clearence by virtue of their tremendous length and size, as such, even in case the cyclist should lose balance, such an accident will probably not be fatal if the cyclist had sufficient side space and could fall towards an open patch of space without getting run over. This would certainly not be afforded if the cyclist and motor vehicle were actually in close proximity or in fact sharing the same lane to begin with. Cars and motorcyclist also should not be allowed to squeeze between trailer and cyclist just because the heavy, long vehicle gave a more generous 2m side clearence when overtaking: this is extremely reckless driving in practice.
To expect cyclist to cycle in single file on roads with more than one lane is to discourage cycling as a viable form of exercise and to endanger the lives of cyclist needlessly.
In any case, in case of an obstruction like road works, fallen tree branch, accident vehicles unable to leave scene, road cleaning machine, plant pruning or plants watering truck, bus stopping at roadside bus stop, all motorist would have had to avoid the left most lane to get pass the obstruction without and complaint or qualms (or wait for the bus to move forwards as the case may be). Motorist who keep a clear view of the road ahead and have good road sense will filter right early while those not paying attention/ having weaker driving skills, will just have to patiently wait for all traffic to clear or for someone to give way and let them filter right-wards to overcome the obstruction on the left most lane.
Motorist need improve their safe driving awareness, make decisions early, as well as be courteous towards each other so that the roads may be of use to all vehicles that are legally allowed to travel on roads.
Cyclist are also well advised to remain two abreast on all roads (other than single lane roads and bus lanes during operation hours) for their own safety and the smooth, accident free use of roads by all legitimate road users.
LTA should educate cyclist to maintain their two abreast riding formation if they are travelling in 3 cyclist or more convoy formation or traveling at speeds of 30kph upwards.
Encouraging bicycle use as a health conscious and environmentally friendly mode of transportation should be a key pillar in Singapore's war against T2 diabetes mellitus, active mobility, optimization of road space and push for a green economy and greater environmentalism.
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Pls see updates to this article at: https://forums.hardwarezone.com.sg/eat-drink-man-woman-16/safety-cyclist-should-always-ride-abreast-left-most-lane-roads-2-a-5962348.html#post118328257