20180806 16403900 1.0 TRUE horizon Areas within 1/2 mile of frequent transit, split into 4 tiers: - Tier 1 (BART and/or CalTrain) - Tier 2 (LRT; overlap with Tier 1 excluded) - Tier 3 (Commuter Rail, including Capitol Corridor, ACE, and SMART) - Tier 4 (Bus stops served by 2+ routes with peak headways of 15 minutes or less, or by BRT)