The Hague currently has an issue with the amount of bikes it has lying around, especially in the city center. Over the last year or so The Hague has opened a handful of new bike parking areas, including under the public library. Future work will be done at The Hague’s two train stations (Centraal station and Holland Spoor).
One of the more crowded areas in the city center is by Hema, where the amount of bikes has doubled over the last few years. The city has started putting free bicycle covers on every bike in the area for advertisement purposes:
Each bike also gets an advertisement on one of their handles, complete with a map of the nearby free, guarded bike areas in the neighborhood.
The trick is that it is free for the first 24 hours – if you do not remove your bike at the end of the day you need to pay to get it back. This in theory prevents the rider from using the area as a free storage area for a few months (only in theory, as some people just never come back for the bike).