This document proposes a transit system for the I-15 corridor in San Diego County. It would include a grade-separated quickway, arterial transitways, and passenger-friendly stations. Core routes and MetroXpress routes would operate along the corridor, with the MetroXpress providing express service between major destinations like Mira Mesa, Rancho Bernardo, and the airport, while stopping primarily at superstations. The proposal aims to create a world-class rapid transit system but notes that elements may need redesign due to construction changes.