Sim City 4: Rush Hour is the first and only expansion pack, more features including U-Drive-It, more transport and more.
Some major additions were Avenues (Less expensive than highways but include more road room than roads), One-Way-Roads (one road focused on the single direction), Ground-Level Highways (Not elevated and less expensive), T-Highway Intersections (for adjoining highways), monorails (for fast transport around busy cities), Elevated Rail (for elevated railway transport), Ferries (for water transport) and a whole lot of new building designs, bridges and civic structures.
Rush Hour adds U-Drive-It which means that you can drive any vehicle (Land, Water or Air) around your own city, you can also drive your Sims car. Such Cars are police cars & vans, ambulances, fire trucks, news vans, garbage truck, buses, taxi's, mayor's limo, hearse, ice-cream truck, tank, frieght and steam train, passenger train, monorial and army truck.
Such Boats are motor boat, speed boat, cigar boat, fishing boat, passenger ferry, passenger and car ferry, tug boat, yacht and metal whale.
Such Aircraft are police chopper, medical chopper, news chopper, skywriter plane, crop duster plane, sky diving plane, fire plane, millitary helicopter, jet and UFO.
Thank's for reading my review,
C U L8R, maxismc.