The main purpose of the study was to investigate the suitability of the shrubs planted on median strip by their physical safety. The study utilized the total impact resistance, impact strength of branch and density of branch by life crash test and develpoed the regression equation. Data were analyzed by descriptive statistics, correlation analysis and multiple regression analysis. The results were summarized as followings:
1. Among five shrubs, the total impact resistance from high to low was Murraya paniculata, Juniperus chinensis var. Kaizuka, Ficus microcarpa cv. 'Golden Leaves', Hibiscus rosa-sinensis, and Rhododendron hybrida.
2. The branch density and branch impact strength could influence the total impact resistance of shrubs. The branch density was more influential than the branch impact strength could influence the total impact resistance of shrubs. The branch density was more influential than the branch impact strngth.本研究之主要目的是以民眾所重視的「實質安全性」來探討道路中央分隔帶內灌木植栽的適宜程度。藉由實物撞擊實驗來探討道路分隔帶植栽之「枝條衝擊強度」、「枝條密度」等特質對於「整體抗撞能力」的影響，並發展相關之迴歸方程式。研究中採用敘述性統計、相關分析以及複迴歸分析等統計方法，進行結果的描述及假設的檢定，經過統計分析後可得到以下研究結果:
1.在五種植栽中，整體抗撞能力由高至低依次為:月橘、龍柏、黃金榕、朱槿、 杜鵑。
2.五種植栽之「枝條密度」、「枝條衝擊強度」兩項與「整體之抗撞能力」皆呈顯 著相關，且枝條密度的相關性大於枝條街擊強度
