Transport
Discover facts about transport. Small discoveries that change the way you see familiar things.
Transport
How runaway-truck ramps stop 18-wheelers
The ramp is a long bed of loose gravel that turns a truck’s motion into friction. The tires sink in and plow through the stones, bleeding off speed until the…
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How colorful tiles helped commuters find stations
New York’s original IND subway used families of tile colors to organize stations along a line. Colors changed at express stops, with following local stations…
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Rome's streets are paved with ancient lava
Rome’s paving stones are basalt, rock formed when lava cools. Cut into blocks, the rough stone grips underfoot and each piece is easy to replace. The city’s…
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The real-life road maze called Spaghetti Junction
At Birmingham’s Gravelly Hill Interchange, ramps stack and weave so traffic can change roads without crossing every other stream at street level. From above,…
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Strange physical phenomenon of aircraft wake turbulence
A wing makes lift by pushing air downward, and the pressure difference curls air into spinning vortices behind its wingtips. Those invisible swirls trail the…
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Why traffic lights use red and green
Red already meant danger and stop on railways, while green signaled a clear route, so early traffic lights borrowed the code. Drivers got simple instructions…
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A bullet train moves its exhaust away from the tracks
Electric trains do not burn fuel onboard to propel themselves, so they avoid an engine's exhaust along the route. Electricity generation can still produce…
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Fishing boats stranded in the Aral Sea desert
Rivers feeding the Aral Sea were diverted for irrigation, and the sea shrank until fishing boats sat on dry land. Their old harbor became desert, leaving a…
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Why bicycles beat cars through city traffic
A bicycle slips through gaps that barely fit a car, then parks in a space too small for a bumper. In stop-and-go traffic, its narrow shape and door-to-door…
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An escalator's landing hides a comb that fits between the steps
Grooves in the moving treads pass through teeth at the stationary landing plate as the staircase flattens out. The close-fitting design helps guide objects…
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Why passenger jets don't fly much faster
Near the speed of sound, air resistance rises sharply, so a small speed increase demands a lot more fuel. Airlines save more by carrying passengers…
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What it takes to deliver a package overnight
A package headed across the country rides a night flight to a sorting hub, where workers send it onto a new plane or truck before dawn. The trick isn’t one…
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Switzerland planned a subway for freight, then hit a financing barrier
Cargo Sous Terrain proposed automated vehicles carrying goods between underground hubs, with road vehicles handling local delivery. In 2025, authorities…
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Road wear cares more about axle load than engine type
Pavement damage rises steeply as the load on an axle increases. Battery weight can make an electric car heavier, but ordinary passenger cars still impose far…
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Why an unpredictable train wait feels so long
A posted arrival time gives your brain an endpoint; an unpredictable wait gives it nothing to count down to. Every glance at the clock becomes another tiny…
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Why tunnels make you speed up
Tunnel walls rushing past can distort depth perception, making drivers unconsciously accelerate. Some tunnels use patterns on the walls to disrupt the effect.
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Why cyclists ride so close together
Riding close lets cyclists draft: the front rider cuts through the air, and those behind push through less of it, saving energy. The lead rider does the hard…
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Why traffic-light yellow phases are so carefully timed
Engineers set yellow intervals using factors such as approach speed, perception and braking time, and road grade. A separate all-red interval can provide time…
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An aircraft seat cover has to pass tests your couch never faces
Airbus lists wear-resistant fabrics and flame-resistant materials among the requirements for aircraft seat-cover options. Color is only the visible choice;…
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How emergency vehicles make traffic lights turn green
An emergency vehicle sends a coded infrared signal to detectors at intersections. The controller clears conflicting traffic and gives the approaching vehicle…
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Why London’s black cabs can make such tight turns
London's black cabs are required to manage a 25-foot turning circle so they can navigate the tight turn at the Savoy Hotel's small roundabout.
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How planes navigate when GPS goes down
With GPS gone, an aircraft’s inertial navigation system tracks every turn and acceleration using gyroscopes and sensors. It starts from a known position and…
Discover moreFierce race to develop fully autonomous electric vehicles is fundamentally transforming our urban infrastructure, forcing smart city planners to redesign massive intersections…
The transition to electric and autonomous transit extends far beyond the vehicles themselves. It demands a complete overhaul of how modern cities are…
Discover moreStaggering logistical wizardry of the global aviation network ensures that at any given moment there are roughly a million people suspended high in the stratosphere inside…
Air travel has become so routine that we completely ignore the sheer physical impossibility of it all. Coordinating tens of thousands of daily flights…
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