Transport
Discover facts about transport. Small discoveries that change the way you see familiar things.
Transport
Train wheels steer with slightly different rolling sizes
The two wheels are fixed to one axle, so they turn together. On a curve, the wheelset can shift sideways so the outer wheel rides on a larger part of its…
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Railway embankments pile dirt to level the route
Where the ground dips, builders pile earth into an embankment so the rails stay level instead of following every bump in the landscape. The train gets a…
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Angle parking creates blind reversing scenarios
Parked cars sit across your line of sight, so backing out of an angled space sends you into traffic almost blind. The parking spot saves room; your neck pays…
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Frontage roads run parallel to main highways
The parallel road collects local traffic, letting drivers reach businesses and side streets without stopping the main highway at every entrance. It’s the…
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Highway medians are barren separation dirt patches
A clear, open median gives a driver who drifts off course room to recover before hitting a tree, pole, or other hard obstacle. It looks like wasted dirt until…
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Why tram wires zigzag overhead
The overhead wire shifts slightly from side to side so the pantograph—the spring-loaded arm on the tram roof—doesn’t rub the same strip of carbon every trip.…
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Zipper road barriers are movable concrete blocks
A zipper machine lifts interlocking concrete barriers, carries them across the road, and sets them down in a new line. That shifts the lane boundary without…
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Cul-de-sacs are intentional asphalt dead ends
A cul-de-sac blocks through traffic, leaving local cars to turn around at the end instead of cutting through the neighborhood. The street is a dead end by…
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Roundhouses were built exclusively for turntables
A turntable in the center rotated locomotives toward stalls arranged around it, so engines could enter a roundhouse facing the right way. Turning a heavy…
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Road camber crowns the asphalt center for runoff
The road’s center sits higher than its edges, so rain runs downhill instead of pooling in the wheel tracks. The pavement gives water an exit before it…
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Edmondson railway tickets were thick cardboard
Edmondson tickets were thick cardboard so they could survive repeated handling and run through date-stamping machines. A conductor punched or stamped the…
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Parking space widths shrink to cram more in
Narrower stalls let a parking lot fit more cars into the same footprint. The arithmetic is excellent; the moment you try to open a door, the lot introduces…
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Why the gap between train and platform exists
A train needs room to clear the platform as it moves, and curves make that clearance trickier because the car body swings outward. The gap is the space that…
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Viaducts are essentially bridges over dry land
A viaduct carries a road or railway across a valley, uneven ground, or a stretch of city—not necessarily over water. It’s a bridge whose scenery forgot to…
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Kiss-and-ride zones physically separate drop-offs
A marked drop-off bay pulls quick passenger stops out of the through lane, while drivers who need to park move elsewhere. One small strip of curb keeps a…
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Why cities were built in rigid grids
Straight streets made land easy to survey, divide into lots, and extend as a city grew. The grid is less a work of art than a ruler laid across the…
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Helical parking garage ramps stack roads vertically
A helical ramp winds upward, letting cars gain height without a long straight stretch of road. Each turn adds a little elevation while keeping the garage…
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Grand central stations required massive land clearing
Trains need long, mostly level approaches and space for multiple tracks, so a central station spreads across far more land than its front doors suggest. The…
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Covered bridges wear roofs to protect the bridge, not you
A roof and walls keep rain and snow off a wooden bridge, slowing the rot that would otherwise eat its beams. The bridge gets its own little barn, because…
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Cloverleaf interchanges consume massive land plots
A cloverleaf sends turning cars around looping ramps so traffic crosses without a stoplight. Those broad curves keep cars moving, but they need acres of…
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Bascule bridges rely on massive hidden weights
A counterweight on the other end of the bridge balances its heavy roadway. The motor then turns a balanced lever instead of lifting the whole bridge’s weight,…
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Buffer stops act as giant metal track bumpers
A buffer stop gives a rolling train something softer than a solid wall to meet: springs or hydraulic cylinders absorb energy as the stop slides back. It is a…
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Why digital boarding passes mimic old magnetic strips
That striped-looking pass is a barcode, not a magnetic strip: a scanner shines light on it and reads the encoded flight details. The screen replaces a swipe…
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Highway overpasses enforce strict clearance heights
The posted clearance warns drivers how much space remains beneath the bridge. Trucks carrying tall loads need that number before they commit to the route;…
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