Bending a road at 90 degrees for a modular road system? I'm building a modular road system. I'm trying to make a road piece that bends around 90 degrees. Essentially a quarter of a circle in shape. I've used (Pi x Diameter)/4 to get the length my road needs to be.

The original piece looks like this. a 10mx10m road piece extended to 100mx10m by using the array modifier and applying it. Extending the length to 157.07963m. Reset Rotation and Scale.





Simple deform modifier seems to be the tool to use.

Something doesn't seem to be adding up though. With a diameter of 200 (200m x Pi)/4 gives me 157.07963. If I start of with this length of road and apply a 90 degree angle bend the final mesh has dimensions of y 38.131m and x 148.49m. I would expect to see y=100 , x=100, i.e the radius. The original mesh is y=10m x=157.08m. 



To make matters worse, when I rotate it 45 degrees, I can see that the top of the ends aren't even straight.



Modifier Used
hatinacat2000's solution is great, but this was really bugging me and I had to find out what I was doing wrong.

My main mistake was having the centre of my road at 0,0 and also the minor mistake of having doubles in there from the array.

It's easier just to show an image of where the road should be. The empty axis is at 0,0.