...The McCain amendment also would have prohibited funds to be used on scenic or historic highway programs, tourist centers, landscaping, outdoor advertising or transportation museums.
However, a key conservative objected, saying the provision didn’t go far enough, because it still allowed that 10% pot to be spent on off-road projects such as bike and pedestrian trails. (That's why RINO Petrie's district is covered with bike trails.)
Sen. James Inhofe (R.-Okla.) said the entire mandate should be eliminated
The Ruling Class decided to keep the 10% requirement.