Questions & Answers about Jalanan di kota ini sering macet.
Jalan usually means road, street, or way.
Jalanan is a derived form that often refers to roads/streets in general, or the roadway/street area as a collective idea. In this sentence, jalanan sounds like the streets/roads rather than just one specific road.
So:
- jalan = road/street
- jalanan = the streets / roads in general / roadway
In everyday Indonesian, jalanan is very common when talking about traffic conditions.
The preposition di means in, at, or on, depending on context.
So di kota ini means in this city.
- jalanan di kota ini = the roads in this city
- jalanan kota ini would sound less natural for this meaning
Indonesian often uses di to show location very directly, so jalanan di kota ini is the normal way to say it.