ACCESSIBILITY(机动性和可达性)共17页

Urban
China Rural
Freeway Expressway Major Street Minor Street Tertiary Street
Freeway 1st Class Highway 2nd Class Highway 3rd Class Highway 4th Class Highway
flows Responsibility and Liability (责任与义务) Transportation Legislation (交通立法)
Mobility versus Accessibility
Mobility (机动性) --- refers to the ability to travel to many different destinations, while accessibility (可达性) --- refers to the ability to gain entry to a particular site or area
ACCESSIBILITY(机动性和可达性)
1、战鼓一响，法律无声。——英国 2、任何法律的根本；不，不成文法本 身就是 讲道理 ……法 律，也 ----即 明示道 理。— —爱·科 克
3、法律是最保险的头盔。——爱·科 克 4、一个国家如果纲纪不正，其国风一 定颓败 。—— 塞内加 5、法律不能使人人平等，但是在法律 面前人 人是平 等的。 ——波 洛克
Collectors --- roadways serving internal traffic movements within an urban area and connecting it with the arterial system, there are two categories: major and minor
United States
Urban
Rural
Freeway
Intor Local Street
Primary Secondary Tertiary
With increase of mobility the accessibility will decrease Freeway has the highest mobility; whereas local street has the highest accessibility
Freeways or expressways --- access-controlled, multilane, divided highways devoted to high-speed, long-distance travel with little or no access adjacent to land
C ollectors(M inor R oad)
Land Access
L ocals(T ertiary Street)
F igure 1.1 R elationship of functionally classified system in service traffic m obility and land
With an increase of mobility the ability to access development decreases, and vise versa.
PRO PO RTIO N O F SER V ICE
M obility
Freew ay
A rterials(M ajor R oad)
Most Likely Authorities
Generic Description
Vehicle Priority (mobility)
1.4 Basic Concepts in Traffic Engineering
Mobility versus Accessibility（机动性和可达性） Highway Classification （道路分类） Uninterrupted （连续流）and Interrupted （间断流）
Arterials --- roadways serving primarily to move traffic between principal traffic generators with partially access-controlled (residential access is discouraged, but commercial access is allowed), there are two categories: major and minor
Local streets --- primarily providing access to the development with low-speed
S. AFRICA GENERAL CLASSIFICATION
Primary Function
Class No
Likely Features
Graphic description between mobility and accessibility
Highway classification
Location -- urban and suburban (rural) Criterion --- specification for roadway design Each country has different way in
determining hierarchy of highways
The purpose of conducting classification for highway is to clarify the functionality of each category of roadways in providing services in terms of mobility and accessibility