dense, thick, heavy (traffic)
En dépit de la circulation dense, nous arrivâmes à l'heure.
Despite the heavy traffic, we arrived on time.
Pendant l'heure de pointe, la circulation à Tokyo est dense.
During rush hour, traffic in Tokyo is heavy.
Traffic is heavy here.
Je n'avais encore jamais vu une vapeur si dense.
I had never seen such dense steam before.
— Nausicaä de la vallée du vent (1984)