在早期私人運具較為普遍之前，公共運輸一向是臺灣一般民眾日常生活中最常使用之主要交通工具；然而隨著汽機車等私人運具的普及，公共運輸的客源便逐年迅速流失。但臺灣身為一個人口稠密的島國，公共運輸使用率的低落將造成國內交通擁擠的情況日益嚴重，故公共運輸使用率的提昇將是各級政府亟需重視的課題。
　　本研究將深入探討國內公共運輸使用率受外在影響之因素。首先，研究將先就「公共運輸」之範疇定義；其次，研究將選擇影響公共運輸使用率之變數，並建立公共運輸使用率之模式。最後，本研究將使用迴歸分析方法進行驗證所建構之公共運輸使用率模式。
　　本研究最後獲致之重要結論如下：
　　1. 家戶經常收入、老化指數、私人運具持有比例及都市計畫區人口數比例對公共運輸使用率均有顯著之影響關係。
　　2. 政府相關部門可運用「針對資源較匱乏之縣市提供相關補助」、「提供老年人口更加友善之公共運輸搭乘環境」、「降低民眾持有及使用私人運具之意願」及「運用大眾運輸為導向之都市發展(TOD)理念進行都市計畫區之設計規劃」等策略以提昇公共運輸之使用率。

Public transportation had been the most commonly used vehicle of the people in Taiwan before the private vehicles became common. However, with the popularity of private vehicles, the usage rate of public transportation was dropped rapidly. But as a densely populated island, the low usage rate of public transportation will cause the more serious traffic congestion in Taiwan. Therefore, the promotion of public transportation usage rate will be an urgent issue for the government in Taiwan.
This study will discuss the affecting factors of public transportation usage rate of counties in Taiwan. First, the study will define the scope of "public transportation"; secondly, the study will select the factors that affect the usage rate of public transportation and then establish a model. Finally, this study will use the method of regression analysis to verify the factors that affecting the usage rate of public transportation.
The main conclusions of this study are as follows:
1. The household income, aging index, the holding ratio of private vehicle and the population ratio of urban planning district all have significant influence on public transportation usage rate.
2. The Government may use the strategy such as “providing the subsidy for impoverished area”, "providing a friendlier public transportation environment for the elders", "reducing the willingness to hold and use private vehicles" and “using the concept of transit-oriented development (TOD) to design the urban planning district” to promote the usage rate of public transportation.

摘　要 I
Abstract II
誌謝 III
目錄 IV
表目錄 VII
圖目錄 VIII
第一章 緒論 1
1.1研究背景與動機 1
1.2研究目的 6
1.3研究範圍與限制 7
1.4研究流程與內容 9
第二章 文獻回顧 12
2.1公共運輸使用率 12
2.2運具選擇行為 15
2.3文獻回顧總結 19
第三章 研究方法 20
3.1相關分析 20
3.2迴歸分析 21
第四章　研究設計 25
4.1旅運行為與旅運型態之影響因素 25
4.2影響公共運輸使用率之假說研提 32
4.2.1因果關係 32
4.2.2假說建立 37
第五章 資料分析 39
5.1公共運輸使用率變數之特性分析 39
5.2公共運輸使用率變數之相關分析 47
第六章　迴歸分析 51
6.1公共運輸使用率迴歸分析 51
6.1.1自變數之間無共線性 51
6.1.2 誤差常態分配檢定 53
6.1.3 公共運輸使用率模式校估 54
6.2假說驗證 57
6.3規劃意涵 61
6.3.1假說檢定結果 61
6.3.2改善策略 63
第七章 結論與建議 65
7.1結論 65
7.2後續研究建議 66
參考文獻 68

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