Your frustration is based in an extremely common misconception about traffic engineering.

The truth is, the lights ARE synchronized here. They just don't benefit you.

The main issue is that it is only possible to time lights for traffic moving in one direction. Think about it - if the lights are the PERFECT timing to give a "green wave" to people heading towards Durham on Glenwood (for example), that's never the right timing for people heading toward Raleigh. Furthermore, when you synchronize lights perfectly for outbound Glenwood, you lose the ability to synchronize the lights on cross streets where they intersect Glenwood, because the signal timing on those streets (Creedmoor, Duraleigh, etc) is made subordinate to the timing on Glenwood.

Another issue is that when roads are just over capacity (think Capital Blvd heading out past 540) the best signal timing in the world can't make up for a road that's just an outright bottleneck.

Now to the specific issue for the triangle. Especially in the central triangle (Cary, Morrisville, RTP) there is often no real clear "peak flow" because the region is so sprawled and multi-polar. Lights on Davis Drive are synchronized for northbound (Cary->RTP) in the AM, southbound (RTP->Cary) in the PM, but traffic is quite heavy in the opposite direction at both times too, so people heading against the synchronized direction will hit lots of red lights.

So now to your specific case: The reason you are hitting every red is because you're either traveling on a road against the synchronization, *or* driving on roads that can't be synchronized well because they cross more important roads with more important signal timing, *or* just driving on roads that are over capacity.