Once the main form of public transport in Phnom Penh, the cyclo is getting gradually pushed out by cars, motorbikes and tuk-tuks.

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All 60, 000 auto-rickshaws in Delhi (analogous to the 3-wheeled tuk-tuks seen in Thailand), for example, are being equipped with a GPS-enabled system.

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Pakistan led the list in 2010 with 2.7 million natural gas vehicles, though many are tiny tuk-tuks, out of a total of 13 million natural gas vehicles worldwide.

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Sinewy men, cigarettes dangling from their mouths, unload boxes of supplies into the waiting trucks, while locals greet their families and clamber into one of the spluttering tuk-tuks lined up alongside the quay.

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Indeed, the few times a second team member does sit up front it's to help the driver navigate big-city traffic, mostly as a second set of eyes out for cyclists, rickshaws and tuk-tuks.

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