By law, the current weight limits on the FDR Drive from 23rd Street to the Harlem River Drive in both directions is posted . Buses are not allowed to use the roadway north of 23rd Street because they exceed the road's maximum clearance and weight (although some do, including the MTA's express buses). All commercial vehicles (including trucks) are banned from all sections of the FDR Drive, except for a short section just north of the Battery Park Underpass where the northbound lanes temporarily merge with South Street.