MY brother’s house in Kathmandu is old, narrow and tall. At the bottom of the house is a dark room which doubles up as an entrance hall and bicycle garage. This is where I am, getting ready to cycle across town.

I’m wearing good trousers (I’m going to a meeting) and want to protect them from the oily chain so I put on bike clips. Then I put on one of those futuristic bike helmets and a dust mask.

Standing in the semi-darkness, gripping the handlebars of the borrowed mountain bike, I feel tough and fit (even though I’m neither). I open the double wooden doors and step out into the bright sunlight, putting on my brother’s sunglasses and completing what is effectively a mask. Nobody can see who I am and I relish the anonymity; I can pretend to be a local as I prepare to dive into the flowing mass of vehicles that pumps through Kathmandu like a great river.

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I take off the mask for a moment and inhale the morning air in the yard; it feels damp and fresh and there is a whiff of incense and rotting rubbish. A proud chicken struts across the yard, puffed up and arrogant, ignoring the stray dog that lies curled up in a ball by the wall. The dog would be white if it was washed but nobody would do such a thing as it doesn’t belong to anyone; it’s the local stray and it’s always here in the yard – sleeping by day and barking all night.

Now I’m on a narrow street that leads up to the centre of Patan, the ancient part of Kathmandu where my brother lives. There are old buildings in this part of town but most of the city has been rebuilt in concrete. Motorbikes fly by continually and the occasional car or small van navigates along sometimes, holding up traffic and bringing the speed down to walking pace.

If Kathmandu was a body these little streets would be the capillaries – small, narrow, anonymous and legion – and the main roads would be the arteries. During the day streets are packed with vehicles, as hundreds of thousands of people hurry to and fro, doing their business, going to work. Two million people live in this ancient city, which was built for a tenth of that number. A taxi driver told me that more and more people are buying cars with easy bank loans, but the government isn’t improving the roads and soon the traffic will come to a standstill: gridlock. Pollution hangs like a blanket over the city.

Soon I reach the main road and plunge in, like a minnow joining a fast-flowing river that is full of racing fish.

When I first got to Kathmandu I looked at the traffic and wondered how anyone could survive it; so many vehicles, no traffic lights and no rules. It looks like chaos. But when I join the flow of traffic, catch up with them, and go at their speed, it feels totally different.

I am now part of the flow and I realise several things: we are moving quite slowly; all the motorbikes and cars are going the same speed as the bikes. There are no white lines marking different lanes, but this is no problem as everyone is keeping an eye on what’s going on in front of them and we form lanes naturally, as if following some natural law. If someone changes lanes, slows down or stops at the side of the road those behind react accordingly and momentarily make a space for them.

The way that cows and people are treated by the traffic is testament to the safety of the system. I made a video of some calves sitting in the middle of a busy road, chewing the cud, talking among themselves, while four lanes of traffic roar past on both sides. These beasts are sacred to Hindus and all drivers avoid hitting them. The same goes for people – nobody wants to hit them – and I’ve seen women cross an incredibly busy road, chatting gaily to one another, not looking left nor right, and crossing over with the absolute confidence that they will get to the other side unharmed.

It feels exciting and I am in a race with the other vehicles. Can I beat that motorbike through this tangle of cars? (Yes! I am nimbler in traffic than his much more powerful machine.) Is my humble bike faster than that flash car? Yes! Lumbering buses and taxis are easy to beat and I’m approaching a bicycle ahead so I accelerate, overtake and leave him in my wake.

I accelerate past a slow cyclist. Ten seconds earlier he had filled my field of vision, overtaking him was my sole purpose in life; but now he’s gone and I’ve already forgotten about him. I feel like a medieval soldier, with sword and shield, hacking my way through enemy ranks, not sparing a thought for those I strike down.

I’m now fully focused on my next move. I’m riding between a battered taxi on my left and a packed bus on my right; I need to get out of this moving corridor; but changing lanes isn’t easy as you must ensure that the drivers see you – if you are seen you are safe – and that means getting ahead of them a few metres. The ability to accelerate is key.

The safest place to be is on the left, the slow lane, but it’s frustrating there as you butt into pedestrians, cows, muddy potholes and the occasional parked vehicle. It’s also far too slow. The most exciting place to be is in the middle of the road, on the invisible line between the oncoming traffic.

The oncoming traffic is being held up by a traffic policeman and a gap appears on the other side of the road. I take advantage and leap into the empty space, racing ahead of my plodding competitors. I race forward on the wrong side of the road and my brain calculates the best moment to dive back into my side.

I reach my meeting with Mercy Corps, an Edinburgh-based aid agency, ahead of time and have a few minutes to dismount, cool down and get into the right frame of mind for chatting to people. I go into the yard of the NGO and lock up my bike with a thin chain, perfectly useless against a proper bike thief; but locking a bike is a ritual for me and it puts my mind at rest. They say that few bikes are stolen in Kathmandu and everyone uses these spindly locks.

I love cycling in Kathmandu but assume most people wouldn’t. Many people I have talked to about cycling in cities complain about cars and believe that the only safe riding is on dedicated cycle lanes. My view is that in Nepal – and everywhere else – you need to treat cars, as well as pedestrians, as hazards and you have to constantly observe and adapt. No point whining about them; it's like complaining about the weather.

Rupert Wolfe Murray is a freelance writer living near Selkirk