Lecture #13 Access Management: Chapter 24, pp

Objectives Understand premise of access management? Understand basic objectives Internalize basic methods

Introduce Operational Aspects What are the basic design concerns of access management? – Achieving proper signal spacing Eliminate signal Reroute cross-street Proper development planning (staged) – Minimizing conflicts by proper median treatments Two-way left turn lanes (TWLTL) (see Figure 24-9) Raised medians (see Figure 24-10) – Minimizing frictions by controlling driveway number, placement, and design – Separating and/or directing flows

Two-way left turn lanes (TWLTL) What are the benefits of a TWLTL? – Remove turning traffic from through lanes – No changes in access needed – Two-stage left turn movements What are the problems of TWLTL relative to a raised median? – Increased number of accidents – Does not make up for the existence of the driveway

Minimizing Frictions How can you minimize friction experienced by arterial through traffic? – Restricting access (number of driveways) Consolidating driveways – Relocate – Redesign Longer Throats Separation of conflicts –One-way access points –Isolate compatible left and right turn movements –Turn bays

Separating and Redirecting Flows How can you separate and redirect cross- street and mid-block traffic flows? – Reroute Elimination of traffic movement Elimination of driveway Converting left turn to right turn – Grouping compatible traffic turns – Consolidating driveways – Frontage roads