Which of the following is a common maritime security measure?

Access control and screening are critical components of maritime security measures because they help to ensure that only authorized personnel and legitimate cargo are allowed access to vessels, ports, or sensitive maritime areas. This practice is vital for safeguarding against threats such as terrorism, smuggling, or unauthorized access that could compromise safety and security.

Effective access control includes identifying individuals who may enter secure areas, verifying their credentials, and carrying out thorough screenings of cargo and vehicles entering the port. By implementing these measures, maritime facilities can better manage risks and protect against potential threats, thereby reinforcing overall security protocols.

The other choices, while they may be relevant in specific contexts or industries, do not directly address the foundational security measures that protect maritime operations. Speed monitoring, for instance, focuses more on safety and operational efficiency than security. Similarly, a zero-tolerance policy on drug use may pertain to personnel conduct but doesn't inherently affect maritime security at a broader level. Likewise, restricted cargo loading hours may be aimed more at regulatory compliance or operational efficiency rather than specific security enhancements.