As mentioned in the Dragon Book, the character Chao is re-used in this video, even going so far as to bring back the original voice actress. Throughout all of DragonBall, Yamamoto Yuriko only ever does the one voice of Chao (who is a filler character), so it just seems extremely odd to redesign such an obscure character for this video, and then call the original voice actor back for this one small role.
As mentioned in the Dragon Book, this video actually takes place in modern-day Japan. So instead of all the funky building and vehicle designs we usually see in DragonBall, we instead get a true-to-life version of West City. Everything from the layout of the park and streets, right down to the payphone and the design of Bulma's kitchen reflect how things would have looked (and for the most part, still do look) in Japan during the late 1980's.
Exactly how and when this video was distributed seems to be a complete mystery. However, I think it's safe to assume that it was either aired on TV between shows as a public service announcement, or it was distributed to schools as a safety demonstration video. Judging from the warning at the beginning of the video, it seems more likely that it was distributed to schools.
The special videos "Goku's Traffic Safety" and "Goku's Fire Fighting Regiment" are both very rare productions designed to be educational films. They were both completed in June of 1988.
An older sister and younger brother are playing with fireworks and nearly set the park on fire, but Goku from the town fire fighting squad helps rescue them from this pinch! Bulma's condominium breaks out into flames. The fire truck's ladder doesn't reach, and Goku has to use Nyoibo to make the rescue! Although "Goku's Traffic Safety" can be a part of "DragonBall", for "Goku's Fire Fighting Regiment" you have to consider that for just 1 episode, even though all the characters appear to be the same, the story takes place in another world. Although they say it is "West City", the setting is actually that of present-day Japan, and instead of being martial artists, Goku, Kame-sennin, Yamcha, and Krillin are all staff members of the fire department and wear fire proof outfits. By the way, the elder sister of the older sister and younger brother is named Chao, and is voiced by Yamamoto Yuriko. Chao comes from episode 79, "Kinkaku and Ginkaku's Man-Eating Gourd", and even resembles how the character looks. Could her identity possibly be of the same character, too? A fire prevention parody version of "Makafushigi Adventure!" flows through this ending as well. Listen to them let loose!