Code                                 Effect  
hardtruckisthebest or wininalottery  Money and license   
openallroads                         Unlock all roads   
advancedmap                          Display hidden containers on map   
freerepair                           Press Backspace for free repair  
freerecover                          Press Ctrl + 5 for free recovery   
fillup                               Unlimited gas   

Turbine:
Pause the game and type turbine.  To use turbines press:
Ctrl + 1 for forwards
Ctrl + 2 for reverse
Ctrl + 3 for up
Ctrl + 4 for down

  

Thanks to Revolution readers Billy Stinebrickner and PJ Losey!