The speed is lowered from 30 mph to 20 mph only between the hours of 8 am and 4 pm, and only for the 1-2 blocks west of National on Grand (in front of Missouri State stadium). The officers will sit, sometimes up to 3-4 cars, in the entryway where buses pull into the stadium, and pull over anyone who forgot to slow down for that 1-2 block zone. The posting that the speed limit is lowered does not have any flashing lights and is not posted very clearly (only once so if you miss it then you are unaware). They mostly sit there around noon. It is good that the speed is lowered because it is by a large pedestrian/university intersection but I also think they should post it more clearly, and extend the school zone for more than a block so people are more aware of it.