We should build an entirely new bus-only (or maybe light rail) route to LaGuardia (LGA). It would follow the existing M60 bus route across 125th street in Harlem (connecting to all north/south subway lines in Manhattan as well as Metro North) and go east across the RFK Triboro bridge to Randalls island.
From Randalls island, the bus would enter a brand new, bus only bridge, taking it across the East River and into the massive private Con Ed property at the northwest tip of Queens. An existing roadway would bring us to Luyster Creek – where a short new bridge (or fill – it is at the end of the creek after all) would connect the property to the end of 19th avenue (a wide road through an industrial area that abruptly and dangerously dead ends).
Once on 19th avenue, it’s a short hop down existing streets to LaGuardia.
The route through Con Ed and over the new bridge would need to be camera enforced to automatically ticket any random drivers who enter (the technology exists in the form of specialized ez-pass readers & traffic cameras).