Road planning is based on technical rules, know-how acquired from expe
rience and professional expertise. A more ergonomics approach to road
planning and safety analyses the psychological procedures used by the
drivers. Every intervention on road network has an influence on safety
. Increasing the coherency of all the interventions in the same area i
s the only possible way of producing areas with a better level of secu
rity. This paper deals with safety procedures, diagnostics and tools w
hich can be used at different levels of intervention. (C) 1998 Publish
ed by Elsevier Science Ltd. All rights reserved.