This goes back some years (somewhere around 1980 or so), but there were originally 2 more north-south freeways proposed by the predecessors to SANDAG. One through inland Poway connecting to Hwy-52 and another between I-5 and and I-15 from Hwy-78 to (I think) Hwy 56. Local politics got in the way, particularly from the folks in Poway. So now they have to drive 15 minutes just to get to a jammed I-15.