Wider aqueduct spans -

If you are creating an aqueduct that crosses a road,
the aqueduct will size itself to match the width of the road,
up to a maximum road width of 5 tiles.

When you are not crossing a road,
it seems to default to 3 tiles.

In some instances, a wider span may be desirable,
if you are focusing on aesthetics in your city.

You can get 4- and 5-tile spans, by laying down a
temporary section of road, creating your span,
and then deleting the section of road.

You must delete the temporary road from either side
of the aqueduct, since, if you delete the road directly
under the aqueduct, it will remove the aqueduct as well.

[This message has been edited by TiggerLAS (edited 06-28-2020 @ 09:19 PM).]