Bookmobile drivers must maneuver their large vehicles in all kinds of traffic and weather conditions. In addition, some are responsible for the maintenance of the bookmobile. Workers who spend a lot of time at VDT's may experience eyestrain and muscle strain, backaches, headaches, and repetitive motion injuries. Most of these workers work regular business hours. Some, such as library assistants, may work evenings and weekends.
Library assistants employed in school libraries generally work only during the school year.
Accounting clerks may work longer hours to meet deadlines at the end of the fiscal year, during tax time, or when monthly and yearly accounting audits are performed. Billing, bookkeeping, and accounting clerks in hotels, restaurants, and stores may work overtime during peak holiday and vacation seasons. Brokerage clerks may have to work overtime if there is a high volume of activity in the stock or bond markets. Order clerks in retail establishments may work overtime when sales volume is high, especially around Christmas. Employment Record clerks held about 3,573,000 jobs in 1992.