The shaft length in woods varies from about 40–48 inches (– cm), with the current standard length for the driver being 45 in ( cm), formerly in ( cm). Graphite shafts are usually preferred for woods due to their light weight, which enables users to generate higher clubhead speeds and thus greater distance. The maximum legal length of a shaft by USGA and R&A rules is 48 in ( cm),  though some woods used in long drive contests have been made with shaft lengths up to 50 in ( cm) long.
Service packs are product-specific, so there are separate ones for each product. Being product-specific does not, however, mean that they are Stock-Keeping Unit (SKU)-specific. For example, Microsoft Windows NT Server and Windows NT Workstation use the same service pack. Service packs are cumulative, which means that each new service pack contains all the updates from previous service packs, as well as any new updates. Users do not need to install a previous service pack before they install the latest one. For example, Service Pack 6a contains all the updates in service packs 1, 2, 3, 4, 5, and 6.
In 2006, the . trucking industry as a whole employed million drivers.  A major problem for the long-haul trucking industry is that a large percentage of these drivers are aging, and are expected to retire. Very few new hires are expected in the near future, resulting in a driver shortage. Currently, within the long-haul sector, there is an estimated shortage of 20,000 drivers. That shortage is expected to increase to 111,000 by 2014.  Trucking (especially the long-haul sector) is also facing an image crisis due to the long working hours, long periods of time away from home, the dangerous nature of the work, the relatively low pay (compared to hours worked), and a "driver last" mentality that is common throughout the industry.