If you're asking about any cities, Tucson, Arizona has both flat areas and hilly areas. The city is bounded on all four "sides" by mountain ranges. The city and surrounding suburbs extend into the foothills of three of those mountain ranges. The City of Tucson embarked on an ambitious project years ago to make the area's roads more bicycle friendly. Separate marked lanes, bike racks on buses and signs reminding drivers to "Share the Road" adorn a widespread area here. We are very fortunate. Every year the "El Tour de Tucson" bicycle race and related events bring worldwide attention to our bike friendly city. Motor assisted bikes are welcome, with certain generous power and speed limits.