IRT Dexter:  Express buses with drivers need to run only during two peak traffic hours for total of 6 hours compared with Rail running 17 hours per day with very small numbers of  commuters during non-peak hours.  Express buses and passenger cars on the two lane reversible carries 17,000 commuters per hour and will eliminate the gridlock at the H-1/H2 merge while the 3000 RAILl commuters per hour will worsen the gridlock at the H-1/H-2 merge  AND cost $11 Billion!