Safe parking lots
Safe parking lots are parking lots (generally in the Western United States) where homeless people can legally park and sleep in their cars overnight. 
Some hire private security guards to make the facility more safe.

Los Angeles county
In 2017, the Los Angeles Homeless Services Authority started a safe parking program that by 2019 had 12 lots with 130 spots, and provides services like portable toilets, food, and social workers, at a cost to the county of $35 per spot per night.

In 2019, when the latest poll showed that 16,500 people were living in their vehicle, the Authority attempted to scale up its program to 300 spots, with requirements that any new lot provide security guards, at least 25 spots, have an empty space between each car, and that each lot be at least 95% capacity every night, for less than $30 per spot per night. The Authority pays about $30 per bed per night for homeless shelters. Churches and community organizations stated that the funding is too low to allow them to cover the costs of the required services, and stated that while $30 per night houses one individual, entire families often live together in one vehicle. This was contrasted to San Diego's program which spends $10 per car per night, but does not employ security guards, and puts vehicles closer together in each lot.

See also
 Social services
 Social welfare

References

Housing
Humanitarian aid
Poverty
Right to housing
Social issues
Socioeconomics
Street culture
Private aid programs