Link to story about LA sign for reference: http://www.slate.com/blogs/the_eye/2015/02/11/guerrilla_public_service_on_99_invisible_richard_ankrom_replaced_a_los

Link to story about LA sign for reference: http://www.slate.com/blogs/the_eye/2015/02/11/guerrilla_public_service_on_99_invisible_richard_ankrom_replaced_a_los_angeles.html http://www.slate.com/blogs/the_eye/2015/02/11/guerrilla_publ...