I plan to develop an aftermarket cruise control system
as a project for my bachelor of engineering degree.
Is there a way to interface the car's cruise control
system (to be able to modify the cruise speed).  Does
anyone have any input or ideas?
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Do you want to make a CC system for a vehicle which
has no CC or do you want to be able to override the
CC in a vehicle that is equipped with it?

Google "aftermarket cruise control" to see technical
articles on the operation of CC systems and dozens
of ads for aftermarket CC systems already developed.

It sounds like a fun project.   Post more details and
someone here will probably have some good input.

Good luck.

Rodan.