| # | Concept | Culture | Statement | Freq. |
|---|---|---|---|---|
| 1 | traffic light | Traffic management culture | Red means stop, green also means reduce speed and prepare to stop | 1 |
| 2 | traffic light | traffic engineering | Key element in traffic management and signaling systems | 1 |
| 3 | traffic lights | traffic culture | Traffic lights are often considered as suggestions, and some drivers may not obey them | 1 |