Abstract: In order to improve safety and accessibility of highway traffic during construction, a safety evaluation model for traffic organization scheme was studied and developed based on visibility graph analysis of space syntax. Then, on the macro level, safety indexes of overall visibility were introduced to quantitatively compare different traffic organization schemes for same area, and a longitudinal comparison of implementation effects of schemes in different areas was also made by using visibility score. On the micro level, an evaluation method on key nodes was established to evaluate visibility safety of single traffic facility. Finally, two actual construction organization schemes, Nanjing Ninglian expressway and Ningluo expressway, were analyzed, and their effectiveness was evaluated by comparing traffic conditions before and during construction. The results show that the evaluation model can assess both the scheme's visibility safety from macro perspective and visibility of key facilities from micro view, therefore reducing disturbance of highway construction on traffic.

Key words: highway, traffic organization, safety evaluation, accident prevention, space syntax