"Ian Johnston" wrote in message
news:cCUlhtvFIYkV-pn2-15gYwGsdV2Bd@localhost...
If a body was found in suspicious circumstances at 1am on the M8, do
you think the police would cover stuff up with plastic and wait until
after the morning rush hour to look for evidence?

Not a particularly good example. There are numerous examples of fatal
crashes in which the evidence is dragged off the road within hours -
basically as soon as the ambulances are gone.

'Getting the traffic flowing' is seen as a priority on the roads - even
where some effort at investigation is made, often one or two lanes will be
open. There doesn't seem much concern for disturbing potential evidence
there.

Richard