IT RUNS THROUGH TOMORROW, FEBRUARY 20.

>>> NOW TO PARIS AND SOME MORE ABOUT THE STATE OF ILLINOIS AND CARS.

PARIS?

>> BRANDIS, ELECTRIC VEHICLES MAY BE ON THE RAGE AT THE AUTO SHOWS.

BUT IF YOU WANT TO BUY A CAR OF ANY KIND, THE STATE OF ILLINOIS PUTS YOU UP IN A LITTLE BIT OF A ROADBLOCK IN FRONT OF YOU.

OUR NICK BLUMBERG HAS THAT STORY IN OUR LATEST EDITION OF WTTW NEWS EXPLAINS.

>> Reporter: AWE, THE WEEKEND.

THE PERFECT TIME TO KNOCK A FEW ITEMS OFF THE OLD TO DO LIST.

RUN TO THE GROCERY STORE, MAKE A TRIP TO THE HARDWARE STORE.

BUY A NEW CAR?

NOT SO FAST, NOT ON SUNDAY.

SINCE THE 1980s, IT'S BEEN ILLEGAL FOR CAR DEALERSHIPS TO OPERATE ON SUNDAYS IN ILLINOIS.

WHY?

WELL SOME OWNERS AND EMPLOYEES WANTED TO SHUT IT DOWN TO SPEND TIME WITH THEIR FAMILIES OR FOR RELIGIOUS REASONS.

BUT PAY ATTENTION.

THIS IS THE KEY.

THEY DIDN'T WANT THEIR COMPETITORS TO BE OPEN AND HAVE A CHANCE TO STEAL BUSINESS.

THE FIRST ATTEMPTS TO CLOSE DOWN DEALERSHIPS ON SUNDAY DATES BACK TO THE 50s AND THE 60s, BUT THOSE LAWS NEVER MADE IT OFF THE LOT.

THEY WERE VETOED AND STRUCK DOWN IN COURT.

BUT SINCE 1984, ILLINOIS CAR DEALERS MUST CLOSE THEIR DOORS ON SUNDAYS.

ILLINOIS ISN'T ALONE.

A DOZEN OTHER STATES DON'T ALLOW SUNDAY CAR SALES EITHER.

IT'S A MESSAGE OF SO-CALLED BLUE LAWS BARRING CERTAIN ACTIVITIES ON THE BASES OF RELIGION SAY LIKE BUYING A SPORTS CAR ON THE SABBATH.

THE RELIGIOUS ANGLE IS WHY ILLINOIS FANS HAVE BEEN CHALLENGED MULTIPLE TIMES.

ONE RESTRICTS CAR SALES TO SIX DAYS A WEEK, BUT ALLOWS DEALERSHIPS TO PICK WHICH DAY THEY TAKE OFF.

YOUS AND MUSLIMS DON'T OBSERVE THE DAY OF REST AND PRAYERS ON SUNDAY.

SOME PRO BUSINESS GROUPS ARGUE THE LAWS RESTRICT FOR E-COMMERCE, BUT SO FAR ILLINOIS HAS KEPT THE SUNDAY CAR SALE BAN ON THEBOOKS, IF YOU'RE LOOKING FOR A HOT DEAL