Even if they stop the road construction this year, I bet it won’t be the last time it’s proposed. So if anyone moves to the area, make sure you won’t be impacted if it someday is approved.
OP, there have been repeated threads on here about horse communities, and many have had issues when non-horse people move there. You might be happier with your own property where you have the control.
Each HOA depends on their own CC&Rs, and you need to see that before you decide if you want to pay the HOA fees, and live with their restrictions. They might have limits on the type of animals, and number you can have, probably limit you to having only your personal animals on the property (no boarders), and may limit where you park your vehicles.
My suburban HOA here charges $300 a year, and covers common areas, pool maintenance, and sidewalk and curb repairs. My street is it’s own HOA, and since the street is public, the city maintains that and the fire hydrants. I also can’t park on the street for regular parking (there is a visitor lot down the street). And no commercial vehicles, in the driveway, or at the house except for service calls. And no boats, trailers, RVs, on the street, or in the driveways. You can park to load/unload a trailer or RV, but not for days at a time.
The next street over has a HOA that charges $60 or so a month, but that includes their pool, tennis court, fitness center, common area maintenance, and front lawn care, plus sidewalks and curbs. So each one is different.
You need to look at restrictions too. My townhouse development in another state charged about $100 a month, and covered all common area maintenance, including our little front yards, and the landscaping, and outside maintenance for the townhomes. However, it also had restrictions on the type and number of animals (domestic pets only, size restrictions, and either 2 dogs, 2 cats, or one of each, no exotics).