Myth: Cyclists should not use the road at rush hour as they slow everyone else down.
Rebuttal #1: Cyclists take up less space in congested areas, allowing more room for cars.
Rebuttal #2: Cyclists do not use the motorways at all (obviously), which still gets congested at these times. How are cyclists to blame for this?
Rebuttal #3: You would introduce a subjective and discriminatory curfew over a subset of society based upon their vehicle of choice, hindering their ability to arrive at work or be at home with their family? Obviously you don't work or have a family otherwise you would be on a bike and not sat in the traffic jam, so may I suggest that your recommendation is taken up, but rather that drivers are not allowed to use the road at your proposed time to allow the free flow of traffic for the benefit of other road users?