One can drive through the Cooling Towers and into Homer's work area.
If one drives into the Springfield War Memorial Stadium, there will be two of the Seven Duffs and three Capital City Goofballs, as well as many spectators and Cletus on the Jumbotron.
There is a drum of Nuclear Waste in the Run-Off Stream, if one needs one more item for Road Rage bonuses.
Marge is the only character needing to go to the Springfield Community Center. Unless one is playing as her.
To save time once you drop the characters off at the power plant runoff stream, you can press the reset buton to instantly spawn on the next available fare on top of the bridge. This imethod saves you a lot of time by not requiring you to drive all the way on top of the bridge. Note this only works if you go to the river from the power plant and not from the mall side.