This sound effect can be found on Series 4000 Hollywood Sound Effects Library, which was made by Sound Ideas.
Clean, Full Length and Unedited Link to the Sound Effect
Blue's Clues Sound Ideas, CARTOON, HORN - BICYCLE HORN, THREE QUICK TOOTS
Monsters University Sound Ideas, CARTOON, HORN - BICYCLE HORN, THREE QUICK TOOTS
Toy Story Sound Ideas, CARTOON, HORN - BICYCLE HORN, THREE QUICK TOOTS
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