Relative node relationship with direction

Hi everyone, this is my first post here and I’m fairly new to using ArcGIS (4 months on and off mainly getting data rather than manipulating and creating).

I am a student using ArcMap 10 for a traffic project. I have a city network consisting of 2 feature classes. 1) A point class which has an intersection ID and the x and y values for the intersection. 2) Is a shapefile feature of the midblocks (or lines between intersections).

All the lines in the shape file have been drawn consistently in the direction SW to NE and SE to NW. Also the midblock start and end points fall exactly on the intersection points.

Is there a way to link the intersection class to the midblock class and preform a basic calculation to find the quadrant (general direction) of a nearby node? The midblock feature class would act as the locator because it starts and ends at each intersection.

Could this data then be written to the intersection class so each intersection ID has its current intersections mapped out around it? (which ID is NE, SE, SW and NW)

Any ideas on how to start or has this been done before?
Thanks
HRP