What is a Dynamic Shoulder Lane?
 Consists of the use of the roadway shoulder as a
general purpose lane only during periods of very
high traffic congestion.
 The temporary use of the shoulder will provide an
effective and economic alternative to relieve heavy
traffic congestion.
 Shoulder utilization as a general use lane is
restricted once more normal traffic flow conditions
are established.
How do you implement a Dynamic Shoulder?
 Effective dynamic shoulder implementation requires full
integration with Intelligent Transportation System (ITS)
 ITS will provide the technical infrastructure (traffic video,
dynamic message signs, speed sensors, etc.) for
implementation while supporting a platform for effective
communication with the driving public.
 ITS is critical in the monitoring of traffic conditions, shoulder
availability, and when high congestion begins to prevail, it will
instruct the traveling public to begin using the shoulder.
 High operational speeds are not permitted on the shoulder.
When high operational speeds are being detected, the
traveling public will be advised to discontinue the use of the
Nationwide Applications: I-66 in Virginia
 The system allows the use of the right shoulder as travel lanes
during designated peak traffic hours. Illustrations to follow.
Shoulder is open on a scheduled basis. Monday – Friday only.
Emergency pull off areas are provided next to the shoulder.
Virginia DOT’s managed lane system is a cost effective and
efficient way to increase capacity of the facility.
A safety analysis presented no evidence that the managed
lane approach during peak hours affects the crash frequency
of the study area.
Lessons learned: Enhanced dynamic message signs are
essential, improve incident detection and quicken response
I-66 Virginia
I-66 Virginia
I-66 Virginia
I-66 Virginia
Dynamic Shoulder Context
 Dynamic shoulder is a component of Active Traffic
Management (ATM) technology.
 ATM seeks to effectively and efficiently use the
existing transportation facility available capacity.
 ATM uses different applications – speed
harmonization, queue warning, High Occupancy
Vehicles, dynamic shoulders, dynamic signing and
rerouting, among others.
ATM Background
 ATM applications are well developed in Europe
(Germany, England, Denmark, Netherlands).
 These countries use a combination of previously
mentioned traffic strategies.
 Specific benefits derived from these applications:
 Increase in overall capacity.
 Decrease in the number of accidents.
 An overall harmonization of speeds during
high congestion.
 Reduction in traffic delays.
Germany - Frankfurt
M42 - England
M42 - England
Transportation Benefits for I-75
 Upgrading from 3-L to 4-L along I-75 only during peak
hour congestion can reduce vehicle density per lane by
26% in peak hour conditions.
Upgrading from 3-L to 4-L will increase service volume
capacity by 34%.
Overall, the service capacity of the interstate can be
extended by several years at a much lower cost than
traditional roadway widening.
The inside shoulder was built with adequate strength
under the “value added” benefit derived by the I-75 IROX
Design Build type bidding.
The dynamic shoulder ITS will be integrated with the
existing active I-75 ITS.
I-75 – Lee County
I-75 – Lee County
 Recommend implementation of Dynamic Shoulder Lanes
along a 12- to 14-mile segment of I-75 (Lee County), pending
FHWA coordination.
 Estimated cost per mile of Dynamic Shoulder Lanes: $1.5 $2.5 million. Cost of comparable traditional roadway
expansion (6-L to 8-L) is approximately $5.5 - $6.5 million.
 The Dynamic Shoulder benefits would add 34% of additional
capacity to the system. This will reduce heavy congestion,
noise and contamination.
 FHWA is very supportive of these technological innovations
as an effective solution to vehicular congestion. It has been
successfully implemented domestically and abroad.

similar documents