Question

Late at night, some traffic signals change patterns and become _____.

Answer 1

combined in color.

Step-by-step explanation:

It's because the modern traffic signals are controlled by the computers, and they are programmed to display different signals for different times of day, night, days of week and holidays etc.

Answer 2

Late at night, some traffic signals change patterns and become flashing lights.

Step-by-step explanation:

This is usually due to the less traffic during those hours of night. The same time varies for national highways where large trucks and lorries continuously travel. To avoid accidents, the dividers are provided with flashing yellow lights for better visibility.

Many traffic signals display flashing yellow and flashing red lights. This means to first stop, wait for a clear intersection and proceed. It is safe to watch out areas and move slowly where drinking shops are nearby.