"What I'd say to this guy would be to watch your speed. There's tight corners around our road, he was slowing down a good 200m before a corner and the corner was almost still too tight for him," he said.
"There could have been kids walking home around the corner and he could have collected them."
Mr Foster's mother Jo took to the neighbourhood website Neighbourly to vent in an open letter addressed to the unknown Maserati driver.
"What you don't perhaps realise is that you were travelling so fast down a narrow 3m-wide gravel road that you were almost killed by two horses escaping your presence," she wrote.
"You took your life in your hands and you endangered the lives of others.
"By travelling at the speed you were travelling at, you endanger the amount of people who use our little road every day.
"The speed you were travelling at means that you would not be able to stop in time for anyone who pulled out within a 200m range of you. Cars regularly travel that road at 100km per hour, you were certainly exceeding this.
"We live on these gravel roads, stop putting our lives at risk because you like to drive your car fast."