page_title: California County Routes in zone G
section_title: History
hierarchical_section_title: California County Routes in zone G / G4 / History
caption_attribution_description: English: Santa Clara County Route G4 (Montague Expressway) near the intersection with Zanker Road in San Jose.
context_page_description: There are 21 routes assigned to the "G" zone of the California Route Marker Program, which designates county routes in California. The "G" zone includes county highways in Monterey, San Benito, San Luis Obispo, Santa Clara, and Santa Cruz counties.
context_section_description: G4 was designated and signed in 1962 along the San Tomas portions. Montague was designated later around 1978. Whether this has anything to do with Montague not being physically signed as G4 is uncertain. Emergency Call boxes along Montague however are labeled as being on G4 leaving no doubt that Montague is part of G4.
  Original plans called for G4 to originate at present day G21's junction with US 101, then head west via present day Capitol Expressway, Hillsdale Avenue, and Camden Avenue where it would have met the present day southern terminus. These plans were never brought to fruition.
caption: Montague Expressway at Zanker Road
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