Introduction and problem statement. Improving road safety is a top priority in the design of roads. The presence of different types of road users gives rise to the need of revising road layouts in order to ensure easy, fast, and safe mobility for all user categories. The concepts of Complete Streets and Road Diet have been already developed in literature, and guidelines are available to help engineers in taking effective design decision for new roads and in the re-design of existing roads as well. Moreover, studies have shown that by reducing the operating speed, the risk of collisions is significantly reduced too.