Bump because I have a priority request.
From a new reddit post I've made:
[WINDOWS][90s - 00s]Children's Game with Trucking; Not Tonka?
Platform(s): Windows PC, mostly like Windows 98 but possibly also/or XP
Region: Australia (Most likely America/UK as well)
Genre: Unknown (Possibly Driving/Educational?)
Estimated year of release: Late 90s, Early 2000s
Graphics/art style: For 4 hours I thought it was a Tonka game. I swear it has the exact same style, but no 3D models. Probably wrong. It's definitely very colorful though.
You were driving on two lane highways or other types of roads. I think most of the roads were desert/suburban. I remember one prop that appeared a lot on the sidewalk was a sign that said something like:
(place)
TURN LEFT
NEXT 20
I might be wrong about that, but they were definitely turn-off signs. I also have this vague feeling it might have had a fast-food chain appearing frequently, but I'm not confident on that.
Notable characters: Somebody was on the radio quite a bit; unless I'm mistaken, they said "Honk your horn if you're happy!" quite a bit (might have been on a sign or license plate). Every time I heard that I would hold down the horn button for a good 10 seconds.
Notable gameplay mechanics: You could honk your horn.
I don't know if you actually steered the truck or not. I think you had to press on signs to turn the truck down different roads, but I might be mistaking that for something else.
Other details: What I'm remembering might be the minigame for a larger game. I went through all the Tonka games; it's not one of the 4 that I own/owned, and it doesn't seem to be one of the ones I didn't own. I could be wrong though.