When it comes to describing a location or route that sees a lot of foot or vehicular traffic, the term "heavily trafficked" can come in handy. However, if you're looking to switch things up and add some variety to your vocabulary, there are several synonyms you can consider. These include bustling, crowded, congested, jam-packed, teeming, thronged, lively, and bustling. Each of these words paints a slightly different picture, ranging from a general sense of liveliness to a more overwhelming feeling of crowding or congestion. By choosing the right synonym for "heavily trafficked," you can add nuance and depth to your writing or conversation.