WITH JULIETTE GOODRICH. >> GOOD EVENING. >>> WHETHER IT'S CARS DOING DONUTS ON SAN FRANCISCO'S EMBARCADERO OR A MOTORCYCLE TAKING OVER IN THE MISSION, IT SEEMS LIKE EVERY WEEKEND THESE NEW VIDEOS EMERGE OF AN ILLEGAL SIDESHOW AND IT HAS BEEN A PERSISTENT PROBLEM ALL ACROSS THE BAY AREA. NOW SAN FRANCISCO IS PROMISING TO GET TOUGH. OUR SOOJI NAM HAS MORE ON THE CITY'S PLAN. >> Reporter: IT'S BECOME A FAMILIAR SIGHT AND SOUND FOR MANY SAN FRANCISCANS. LARGE GROUPS OF MOTORCYCLISTS PARTICIPATING IN LOUD SIDESHOWS. >> THE MORE TIME THAT WENT BY, THE MORE UPSETTING IT BECAME TO THE PEOPLE THAT WERE WORKING IN THE RESTAURANT, THE OTHER DINERS. THE RESTAURANT STARTED TO SMELL LIKE BURNT RUBBER. >> Reporter: SHARKEY LAGUANA WAS TRYING TO ENJOY DINNER WITH HIS FAMILY THIS PAST WEEKEND NEAR 23rd AND VALENCIA STREET IN THE MISSION DISTRICT WHEN THEY INTERRUPTED BY THESE DIRT BIKES FOR MORE THAN AN HOUR. HE EVEN SAYS HIS FRIEND'S WIFE WAS HIT BY ONE OF THEM. >> HE SAID HIS WIFE WAS DRIVING IN A CAR WITH TWO CHILDREN IN THE CAR AND ONE OF THESE MOTORCYCLES COLLIDED WITH THE BACK OF THE CAR, SMASHING THE BACK WINDOW. >> Reporter: IT'S NOT JUST DIRT BIKES WREAKING HAVOC IN THE CITY. BACK IN JUNE A CAR WAS TORCHED AND CROWDS SET OFF FIREWORKS AS PART OF THIS WILD SIDESHOW ON THE EMBARCADERO. NOW A NEW CRACKDOWN ANNOUNCED BY MAYOR LONDON BREED COULD BRING STIFFER PENALTIES FOR BOTH CARS AND MOTORBIKES INVOLVED IN THE ILLEGAL STUNT DRIVING. THE PROPOSED LEGISLATION WOULD MAKE IT A MISDEMEANOR TO PLAN AND PROMOTE A SIDESHOW, A TACTIC SEVERAL BAY AREA CITIES ARE TRYING. IT WOULD ALSO INCREASE THE AMOUNT OF TIME A VEHICLE MAY BE IMPOUNDED. >> WITH OUR DISTRICT ATTORNEY'S SUPPORT, WE ARE CHARGING THE LAW SO THAT THE D.A. CAN KEEP THE CARS LONGER AND IF THERE IS A CONVICTION, THE CAR CAN BE SEIZED PERMANENTLY. >> Reporter: SAN FRANCISCO POLICE CHIEF BILL SCOTT SAYS THEY'VE SEIZED NEARLY 70 CARS FROM 15 SIDESHOWS CITY-WIDE THIS YEAR AND WITH THE PASSAGE OF PROPOSITION E, POLICE ALSO HAVE A NEW TOOL TO CRACK DOWN ON SUSPECTS. >> WE NOW HAVE A DRONE PROGRAM. WE PLAN TO TAKE FULL ADVANTAGE OF USING THAT TECHNOLOGY TO ENHANCE OUR ABILITY TO IDENTIFY CARS AND PEOPLE THAT ARE INVOLVED IN THESE SIDESHOWS AND MORE IMPORTANTLY, TO SEIZE CARS AND MAKE ARRESTS. >> Reporter: A PERUVIAN RESTAURANT ON VALENCIA STREET TELLS US THESE SIDESHOWS HAVE BECOME FAR TOO COMMON. >> LATELY I WOULD SAY PROBABLY LIKE TEN TIMES ALREADY. PEOPLE DON'T WANT TO COME IN BECAUSE THEY ARE SCARED AFTER SEEING THAT. >> Reporter: HE SAYS THIS LEGISLATION IS A STEP IN THE RIGHT DIRECTION. >> THEY HAVE TO START FROM SOMETHING TO STOMP BACK. LIKE I SAID, IT'S GETTING WORSE AND WORSE EVERY TIME. >> Reporter: SAN FRANCISCO POLICE SAY COMMUNITY TIPS HELP THEIR INVESTIGATIONS TREMENDOUSLY AND SO IF YOU SEE ONE OF THESE LARGE SIDESHOWS, TO CALL POLICE AND TO ALSO SEND IN PICTURES. >> THE LEGISLATION WILL BE IN FRONT OF THE BOARD OF SUPERVISORS THIS FALL. MA YO R LONDON BREED SAID