During the past 20 years, the wheelchair race has been held as an exhibition event, with no prize money or awards.
The wheelchair race was resumed after 14 years of hiatus, with full marathon and 3km courses.
Davidson was a force in the London Marathon women's wheelchair race during the mid-1980s.
Ballard first entered competitive wheelchair races in 1994, at the age of twelve.
Until a year ago, the wheelchair race was an exhibition event.
The event also includes a wheelchair race which precedes the footrace.
The half marathon and wheelchair race then follow the same route.
He is entered in the 100- meter, 200-meter, 400-meter and 800-meter wheelchair races in the summer Games.
A fast final quarter would take about fifty-five seconds in a top wheelchair race.
In 1983, the first wheelchair races took place.