I was visiting my sister today who has two wombats in her care at the moment. Most of the wombats she cares for have been orphaned and need regular feeding and nurturing until they are old enough to be released. She does have an outside pen but usually at this age they are inside with hot water bottles and blankets!
This was a new wombat that had come in and needed to be treated for mange so she brings him home for some after hours care.
Here he is getting his special anti itch wash.
A towel dry....
And a bottle!
This was a younger wombat that was found in its mothers pouch after she had been hit by a car.
It is still young so needs regular feeding with a special milk formula. At this age it is still quite small so it would need feeding every 4 - 5 hours.
Wildlife accidents can be prevented by noticing the warning signs on the roads and slowing down in those areas. Animals mostly come out at night so be more cautious then.
If you do hit an animal or see an injured animal call a wildlife emergency shelter. In Australia there are many shelters and carers. Here are two main organisations....
Wildlife Information and Rescue Service
http://www.wires.org.au/
Wildcare Australia
http://wildcare.org.au/
But check your local state for their Animal welfare Services.