Possibly, but all base modifiers are in the top. Only modifiers for specific yields or commerces are displayed in the second part.
In the tooltip for the route sure, it's unambiguous. I was thinking about the source of the modifiers. Does +50%
![Commerce :commerce: :commerce:](/images/smilies/civ4/commerce.gif)
![Commerce :commerce: :commerce:](/images/smilies/civ4/commerce.gif)
Only icon I can use otherwise would be a![]()
Seems good.