What are possible obstacles to the implementation of Sustainable Safety measures?

Over the years, quite a number of Sustainable Safety measures, or measures in the spirit of this vision, have been applied [6] [56]. Yet, in a number of situations and at different places compromises have been made or measures have not gained traction.

The obstacles having featured in the roll-out of Sustainable Safety may be summarized as follows[60]:

1. Lack of knowledge about effective measures and the way in which these measures relate to the vision.
2. General problems, such as a difference of interests and lack of physical space and resources.
3. Decentralization and the subsequent liberty for different regions to do things their own way (and possibly less effectively) have also played a role.
4. Deviating from the knowledge accumulated in guidelines has also been permitted (see also [61]) which has put a strain on uniformity to all road users and turned suboptimal solutions into legitimate options.