- "Ejection seats save lives."
- —Hill Valley greeting sign.
Ejection seats were necessary measures in 2015 with the advent of hover conversion. As vehicles might collide in mid-air while traveling along the skyways, another method of escape was devised, in this case the ejection seat, which may have allowed the driver and/or passenger(s) to eject upon impact.
On the 2015 Hill Valley greeting sign, flyers were reminded about the importance of ejection seats ("PLEASE FLY SAFELY / EJECTION SEATS SAVE LIVES").
However, no mid-air collision scenes occurred — apart from a near miss involving a taxicab when the DeLorean time machine appeared in Skyway C25 in the wrong lane and facing oncoming traffic — so it remains unknown as to whether or not the DeLorean had these installed when it was hover converted.
- Back to the Future Part II (Mentioned on greeting sign)