Boundaries may be needed to define the perimeters of transport infrastructure. These need to be constructed in a way that does not restrict informal surveillance. For example, a high solid wall obstructs visibility while, 'open' fencing does not. Landscaping can improve the appearance of the infrastructure and create harmony with the local environment, but care needs to be taken to ensure that landscape features do not become targets for vandalism or provide cover for criminal activity. For example, dense shrubs can provide hiding places for potential offenders, and create anxiety for passengers and pedestrians.
Lighting can help allay fears after dark.
This should simulate daylight but not create pools of intense brightness, silhouette on-coming pedestrians or temporarily blind people with its intensity. Visibility is a key requirement in designing for personal security. It is not only the ability to see ahead and along a route, but in the event of a potential threat, to have the space and time to plan and take avoiding action. Blind corners, recesses and wide pillars can provide hiding places for the attacker Where these are unavoidable, sightlines can be extended through the use of mirrors. The use of clear glazing can facilitate visibility while providing protection from the weather.