If curbs are so important why are there some areas of Lemoyne that do not have them?

In 1905, Lemoyne became an incorporated Borough.  It had 800 residents and a few roads dirt roads. When it rained, these streets turned into a muddy mess, and travel was difficult and hazardous until the water drained into the ground or evaporated from the surface.  There were few personal vehicles.  People walked from place to place, or they used trolley cars which ran on railways in the middle of the streets.  Over time gas powered buses were added to the transportation mix and the trollies were phased out.  At the same time the growing numbers of car owners required roads that were better than dirt.  Concrete and asphalt was eventually installed, but this improvement caused a problem with drainage.  Sidewalks and gutters had to be added to keep the standing water away from pedestrians and in the gutters until it evaporated or drained off.  Later, underground drains were added to improve water runoff.  Other parts of the Borough did not experience these problems as severely, so curbs and sidewalks were not always required. 

Please note, it is possible that your curb and sidewalk was put there by the prior owner and was not required by the Borough.  However, once installed, they must be maintained by the current property owner.