Higher gas prices are bringing some Americans back to public transit. The increase in ridership comes as the war in Iran has disrupted oil shipments through the Strait of Hormuz, pushing the national average price of gasoline beyond $4.50 per gallon . In California, drivers are paying more than $6.15 per gallon on average.  Rising fuel prices have historically pushed at least some Americans toward buses and trains, particularly commuter rail. But experts caution that decades of car-oriented development and inconsistent transit funding still leave most people with few practical alternatives to driving. For those reasons, ridership is rising most sharply in places with robust transit systems and steep fuel prices. California is a clear example. Transit agencies in San Diego , Los Angeles County , and the San Francisco Bay Area have seen ridership jump in recent weeks.…