There are times when kangaroos can become dangerous to human beings like for instance when people are driving and kangaroos would like to cross the roads. It is best that you will follow the proper speed and your brakes are working so that you can use your brakes to avoid getting into an accident.
It is also not ideal if you would be too close to kangaroos because they might think that you are a threat to them and to their young. You need to keep your distance and just admire them from afar. Kangaroos are not aggressive by nature but they have a tendency to become aggressive depending on your attitude.