Mrs Southan did not need to get a ride that day - surviving the 6.4km walk from her home, which she now does regularly.
"I have lost weight, I have a couple of twin boys who are 9 and it's encouraged me to get up off the couch and do more with them. I used to come home get everything done as quickly as possible, then sit down in the afternoon and on weekends. Now I make the effort."
Trip Switch, a seven-day challenge which started on Monday, encourages people to get out on the iWay tracks. It tied in with an eight-week 10,000 Step Challenge, which Mrs Southan was doing for work.
"It's just another motivator, you can win some great prizes and I was am already out walking."
Project manager Owen Mata was inundated with people emailing through their positive experiences and said they were on track to receive over 1000 entries.
"I'm really pleased with it, we are getting heaps of feedback. I never thought it would be this big. There are a lot of people realising how easy it is."
He was surprised by the number of businesses getting behind the campaign.
"There are some people out there who are really doing a lot to promote it. It's fantastic that they are giving it that push."