Final answer:
An 'unmarked crosswalk' exists at intersections without marked crosswalk lines, allowing for the legal crossing of pedestrians and suggesting that a traffic signal could enhance safety.
Step-by-step explanation:
According to the Transportation Code, an "unmarked crosswalk" only exists at intersections where there are no marked crosswalk lines. An unmarked crosswalk is considered an implicit pedestrian pathway at intersections even if there are no painted lines. This concept is crucial for pedestrian safety, as it indicates that pedestrians have the legal right to cross the road at these locations. However, without physical markings, many pedestrians might find it challenging to cross safely, thus leading to the suggestion that installing a traffic signal would significantly improve safety by controlling pedestrian and vehicular traffic flow and ensuring safe crossings at appropriate times.