The cavalcade will step out from the Parihaka Pony Club on Cartwright Rd, along Onerahi Rd, past the shopping centre and around the roads circling the airfield before heading back to the pony club.
"I do hope people see it as a positive, fun thing. We don't want to be disruptive in any way," local co-ordinator Cherie Bateman said.
She is not sure how many riders will take part but anyone is welcome to bring their mounts to the start point.
The club has agreed to be the meeting point as it is central, off busy roads and is set up for horse trailer parking.
Ms Bateman said horses and riders should be assembled and ready around 9am.
While it will not feature celebrities-on-horseback as some other events will, the Whangarei ride has a few of its own quirky twists.
It will need to be completed between 10am and 11am, while there is a window between flights into the airport, Ms Bateman said.
A team of volunteers will act as pooper-scoopers so no horse manure is left on the roads; unless keen gardeners beat them to it.
And, the airport management will turn off it's bird-scare gun while the horses go past.
Ms Bateman said she expected some younger riders' mounts to be led by parents or friends, and many pedestrians to join in.
Paparoa woman Simone Frewin started the national campaign after her friend, journalist Karen Rutherford, was badly injured when a driver hit her and her horse at 80km/h in a rural location near Auckland.
The horse, Curious George, had to be euthanised.
"We want to educate drivers that passing at 20km/h and giving a horse a 2m berth is crucial for the safety of both motorist and rider," Ms Frewin said.
"It takes less than a minute out of your life to slow and pass safely - or you can take a life in less than a second, if you don't slow down."
New Zealanders own more than 80,000 recreational and sport horses, many of which are ridden on rural roads, Ms Frewin said.
"Urban sprawl is encroaching on rural areas and most city drivers have no idea how to behave around horse traffic, or appreciate that even the quietest horses can be startled."
Ride for Road Safety campaigners believe legislation is ambiguous in stating motorists must "pass wide and slow".
"When you're travelling at 100km/h on a rural road, see a horse and slow to 70km/h, many think they've slowed significantly but if you hit a horse and rider at that speed it can be deadly.
"Motorists need clarity and riders need better protection in law with a 20km/h speed limit like we have when passing a school bus."
