In my opinion a plausible explanation is one which might possibly be supported by evidence. We know of at least one vehicle driving past. That is evidence that there was at least one. Know of any others?
On the other hand there is evidence that the roads in Luz were quiet that night.
This is a quick response to a reasonable question. In my opinion it makes more sense to stick with the OG theory of abduction because they may have more information than is publicly known. But as a possibility an RTA is not out of the question, IMHO.
I think what you are asking me to do is some kind of frequency analysis on the traffic to justify how likely it is an unsupervised child could be hit by a car is sleepy Luz.
By extension the same argument could be levelled against a possible abductor: what is the frequency of potential abductors passing an unsupervised child in order to analyse the chance of a stranger abduction.
I prefer to analyse it in the following way (but obviously you are free to disagree):
1) Children go missing, for short periods, all the time.
2) In 99,999 out of 100,000 (or what ever the unknowable odds are) they are found safe and well
3) Therefore you only hear about the rare events.
4)
By definition Madeleine was affected by a rare event, e.g. an abductor or possibly a carThe example of this is James Bulger. After his mother lost sight of him for a few minutes, what were the odds of him being abducted from a shopping center by two young boys? Extremely remote IMO, possibly even less than an unsupervised child being hit by a car in Luz.