https://joy.videvo.net/videvo_files/video/free/2017-06/large_watermarked/161022_020_SanFrancisco_1080p_preview.mp4 Steep Hill Sign in San Francisco A shot of a road sign in San Francisco warning drivers of steep hills. 1080pamericaamericancaliforniacautioncityFranciscohillsmountainoussansignsiliconsteep hillurbanUSusavalleywarning