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How to Make a hump backed bridge in 4 Steps

1. Create a room, subtract a tube, you need to start under the floor the same distance as the height of the bridge, in this example the bridge is 3 units tall, therefore I started the subtraction at -3
2. Union another tube inside this one, this needs to be the same depth, but smaller by 2 in the x and y direction, this meant starting the union at -2, as you can see from the picture this creates a hole underneith the bridge, so we need to fill this in
3. Subtract a block the size of the second tube, starting from the same place, but only moving up to ground level (from -2 to 0)
4. To finish it off, subtract a ramp from either end, you may need to reduce the grid size to make the ramps the right height.
And the final Product...

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