Not necessarily. Sometimes we actually do need a project completed quickly. Like if the owner of the road tells us we have to finish before they start their scheduled work. So in that case we put the time limit in the bid documents. That will likely makes the bids come in higher than they would otherwise.
well the slick road should have been closed.
To leave it open is attempted murder
Or at least made safe in some manner.
This being FQ, it would be more accurate to say that any possible injuries or death would be due to negligence, so any potential criminal charges in the event of a death would range from criminally negligent homicide to involuntary manslaughter, depending on the severity of the reckless behavior. But not murder or attempted murder.
In practice, they typically make the roadway surface as safe as possible, and put up lots of warning signs and speed restriction signs. They might also restrict traffic to local traffic only.