Getting around Jakarta is a problem. The city layout is chaotic and totally bewildering, traffic is indisputably the worst in South-East Asia with horrendous traffic jams slowing the city to a crawl during rush hour, and the current railway system is inadequate to say the least. The construction of a monorail system, started in 2004, soon ground to a halt over political infighting and the main glimmer of hope is the gradually expanding busway system.
There are still many parts of Jakarta which are traffic free and full of trees, flowers, little red roofed houses and friendly people. These areas are generally safe for walking. Some people would say that walking around the center of Jakarta is not recommended.
With the exception of a few posher areas, sidewalks are crowded with pushcart vendors, drivers disregard pedestrians, crossing streets can be suicidal.On many busy streets there are no pedestrian crossings, so it's best to latch onto a local and follow them as they weave their way through the endless flow of cars.
Muggings do occur, especially on overhead bridges, and can happen even in the daytime. If you use pedestrian bridge, watch out for motorcycles and bicycles that often use the bridge illegally. Now, Jakarta has more pedestrian bridges as supporting infrastructure for Transjakarta Busway is being built. But, be careful when you walk on those, as lack of maintenance can cause annoyances such as unstable or missing steps.
In the near future, it will be probable to walk around the Jakarta Old Town area as the local government is currently undertaking a project to create the old town area into a pedestrian-friendly zone.