xkcd

xkcd #3097: Bridge Types

Title text:

Pontoon bridges are just linear open-sided waterbeds.

Transcript:

Bridge Types

[A 4x4 matrix of 16 ways to cross the same rectangular hole in the ground]

Plank [shows a plank laid over the hole]

Rope [shows a rope bridge with rope guardrail]

Truss [shows a truss bridge with a triangular truss above the bridge deck]

Trestle [shows a trestle bridge]

Arch [shows stone arches supporting a straight deck]

Suspended Arch [shows a single arch, with the bridge deck suspended from it]

Draw [shows a truss bridge, with one half opened like an unrealistic draw bridge]

Suspension [shows the bridge deck suspended from a cable strung between two pillars and the shores]

Filler [shows the hole filled with dirt and stones]

Budget Overrun [shows a bridge deck suspended by cables from an artistically shaped pillar]

Jump [shows two ramps at the edges of the hole, and a skateboarder jumping across the hole]

Halfhearted [shows a ramp at each side of the hole that leads down to the bottom]

Waterbed [shows the hole filled with water, two fish and an octopus, a wobbly covering, and two stick figures crossing]

L'Engle [shows the hole warped such that the opposite shores meet]

Fun [shows a loop-de-loop rollercoaster bridging the hole, and a skateboarder using it to get across]

Repurposed Elevator [shows an elevator tower, rotated sideways as a whole, laid across the hole. 2 stick figures using the elevator are also rotated.]

Source: https://xkcd.com/3097/

explainxkcd for #3097