''It's a case of there but for the grace of God I suppose.''
She says there is never any pressure from the Cancer Society.
''You can say you aren't available for a time and that's fine. If they ring last minute and I can do it, all well and good, and if I can't they're fine.''
She says the defined role doesn't stretch beyond getting people to appointments and back home.
''It's not my place to be a support person, but if they ask you [to accompany them], you aren't going to say no. I don't ask questions. If they want to tell me, that's fine, it just doesn't go any further. And sometimes there isn't anybody else for them to talk with.
''You just meet some lovely people and their stories are all different.''
Prior to retiring, Colleen worked at Carter House.
''I was there for many, many years and did a lot of palliative care,'' she says. ''I also did a lot of voluntary care of people who needed help - but not under the umbrella of the
Cancer Society.''
Apart from a police check, there are no other requirements apart from the right personality.
''You never use sympathy, but you have lots of empathy,'' she says.
Drivers have to be cautious about getting too close to the people they transport, but at the same time friendships have developed once patients' treatment has finished.
''One particular lady and I clicked really well and the day she stopped her treatment she said, 'right, we can go out for lunch now' and we've been friends ever since.''
Colleen is also a volunteer collector for the society and will be outside Countdown ''with my hottie under my jacket'' tomorrow and Saturday.
Anyone wanting to volunteer for the Cancer Society as a driver or in any other role can send a email to volunteer@cancersociety.org.nz.