Final answer:
A street that opens at only one end and includes a turnaround at the other end is called a cul-de-sac. This design is implemented to restrict through-traffic and create a quiet, safe neighborhood environment.
Step-by-step explanation:
Streets that open only at one end, with provision for a turn-around at the other, are known as cul-de-sacs. This term refers to a dead-end street with only one inlet/outlet. A cul-de-sac is designed to limit through-traffic in residential neighborhoods, providing a quiet and safe area for the local community. In contrast to a cul-de-sac, an arterial road is a major road intended for high traffic flow. A local street typically serves a small number of residences and has low traffic. Lastly, a boulevard refers to a wide multi-lane road, often with a median and trees along the sides, meant for both traffic and aesthetic purposes.