SAN FRANCISCO (KRON) -- San Francisco Mayor London Breed is proposing a new city policy in an apparent effort to get tough on people living in RVs on city streets. On Friday, the mayor announced a proposed city law that would allow RVs to be towed if inhabitants refuse shelter. Under the current San Francisco Transportation Code, overnight parking by oversized vehicles is prohibited on some streets, but not all. The new proposed policy would make overnight parking by inhabited RVs a towable offense between midnight and 6 a.m. -- if an offer of shelter, housing and/or services is rejected. Cisco layoffs to impact hundreds of Bay Area workers Current overnight parking restrictions, according to the mayor's office, will continue to exist on approved streets. The mayor's office called the proposed law "a new tool to get people to accept shelter, housing and services" for those living in oversized, recreational vehicles. "The legislation will ensure city streets are used for the purpose for which they were designed -- transportation -- rather than serving as unofficial parcels for inhabited oversized vehicles," the mayor's office said. According to the mayor's office, the SF Department of Homelessness and Supportive Housing and City agencies regularly offer RV dwellers services and referrals, including: Paying for repair and relocation of RVs, including paying for the rent and fees at an RV park of their choice Access to shelter Rapid rehousing vouchers, permanent supportive housing, and hotel vouchers Relocation services, including using the Journey Home program “San Francisco is a compassionate City that will always lead with offers for housing and shelter,and other supportive services, but we must enforce our laws to ensure that our streets are safe,livable, and accessible to everyone,” said Mayor Breed. “Since the Grants Pass decision grantedus the authority to resume enforcing local laws on our streets, our message has been clear:accepting our help is not just an option, it is the option. If someone is offered housing, shelter,and support but turns us down, they cannot remain on the streets. Today’s legislation will allowus to apply the same principle to people living in RVs.” Existing city policy makes it illegal to live in a vehicle on city streets. RVs parked on streets, according to the mayor's office, can present public safety hazards that include impaired sight lines for drivers and illegal dumping of garbage and waste matter. Oversized vehicles also decrease already limited on-street parking in some districts. The proposed legislation will be taken up by the San Francisco Municipal Transit Authority Board of Directors on Tuesday, Oct. 1.