It is an Old Song

State policemen manage their jobs by exception – as do most business managers and owners. The short check list they use to select the vehicles they pull over for an inspection starts with two items: no license plate, and no visible placards.
If you make the decision NOT to attach your transporter plate to your vehicle because it is cold outside, be aware that the result of this decision may be that you go through a complete driver and vehicle safety inspection, and you may receive CSA points in addition to being delayed.
If you elect NOT to display one placard on each side of your vehicle so that it is visible at 50 feet as the law requires, be aware that this decision on your part may well result in a complete driver and vehicle safety inspection, and a delay and CSA points may well be in your future.
The little things are critical, and they are generally pretty simple and easy to observe.
An MTI driver was fined $290 last week, and required to pay an 18 year old ticket. The officer told this driver that had he displayed placards and a plate he would not have been stopped at all.
It is simple cause and effect.