If anyone wants to go really deep on the history and making of Speed, check out the podcast 50mph. Fifty episodes that tell the story from start to end and has an interview with Keanu and Sandra in one of the last episodes.
Really good stuff. You learn than Speed was originally just set up as a cheap action film, they never expected the success they achieved.
Also, the script was briefly considered as an idea for the next Beverly Hills Cop movie.