What is a common feature of radar speed detection systems?

Radar speed detection systems are designed to measure the speed of moving vehicles accurately and efficiently. One of their common features is the inclusion of data storage capabilities. This allows law enforcement agencies to record the speed data and traffic information over time. The ability to store data is crucial for a variety of reasons: it helps in analyzing traffic patterns, assists in legal proceedings if necessary, and allows for historical data analysis to improve traffic safety measures.

The other choices do not reflect typical functions of radar speed detection systems. For instance, physical barriers are not a requirement for radar systems to operate; they can function effectively in open areas. Furthermore, while some systems might be automated, many radar units can be operated manually or automatically, making continuous manual operation unnecessary. Lastly, radar speed detection systems are capable of functioning in various weather conditions, although certain extreme conditions might affect performance, they do not solely operate only in favorable weather. Thus, the inclusion of data storage capabilities stands out as a fundamental feature.