H-drive H-drive An H-drive drivetrain is a system used for heavy off-road vehicles with 6×6 or 8×8 drive to supply power to each wheel station. H-drives do not use axles but rather individual wheel stations, usually carried on a punt chassis. A single differential splits the drive into separate left and right drive shafts, which each run fore and aft inside the bottom corners of the chassis. At each wheel station a bevel box drives the half shaft out to the wheel. H-drive is not commonly used for 4 wheel vehicles, as it is relatively complicated for small vehicles. It has
Frontage road Minnesota Drive Expressway (from West 100th Ave to Dimond Boulevard) in South Anchorage. Also, the George Parks Highway (Alaska Route 3) has two-way frontage roads running along it from the Trunk Road exit to the Seward Meridian Parkway exit (Fireweed Road on the south side and Blue Lupine Drive on the north side) in Wasilla. Frontage roads are not very common in Arizona but do exist along certain freeways. I-17 Black Canyon Hwy./Maricopa Fwy. is the oldest freeway in the Phoenix Metropolitan area to have a frontage road. Some sections of the frontage road was reduced to a single lane