How to Build a Road | Wendover Productions
Wendover Productions

How to Build a Road | Wendover Productions

B2Upper-intermediateSeptember 28, 202627 min
  • Documentary

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Sentence 6 of 12 · 0:17

Flat roads are dangerous.

,

the corners inward to counteract centripetal force and give the car more friction.

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  • B20:17
  • B22:50
  • C15:53
  • B28:33
  • C111:55
  • C214:51
  • B216:58
  • C119:26

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B2

B2 · Upper-intermediate

Comfortable if you already follow TV news

A1 8%A2 32%B1 25%B2 22%C1 13%
  • 65% of the words are B1 or easier.
  • 141 words a minute: a natural pace.
  • 234 harder words (B2 and up) in the whole episode.

Transcript

The opening of the episode. The whole transcript is in the player.

0:00

So, you want to build a road. First is perhaps the most impossible feat—finding a route. That's because roads have a particular shape that Earth often does not. Both linearly and laterally, they're fairly flat, but not completely flat.

0:15

Flat roads are dangerous. A flat turn will increase the potential of a car skidding off, so road designers slope the corners inward to counteract centripetal force and give the car more friction. The higher the speed and the sharper the turn, the more slope the turn needs, meaning

0:29

there is a theoretically safest slope for a turn. The American Federal Highway Administration has a formula that converts design speed and turn radius into a suggested slope, but that's only their interpretation of it. Road designers and mathematicians endlessly shoot academic papers back and forth debating

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