Road Weather Management Program - FHWA Operations - U.S. ...

Best Practices for Road Weather ManagementVersion 3.0The IAP concept has been tested through many Table Top Exercises (TTX) conducted withstate and local partners and through a full-scale exercise last year for the simulated reversal ofI-26 from Charleston to Columbia. The full-scale exercise entails bringing all assets, those oflaw enforcement and SCDOT traffic control devices, to each interchange on I-26 fromCharleston to Columbia. The Interstate is not actually reversed but everything necessary to doso is at the roadside. The IAP concept is continuously exercised with the state’s annual fullscalesimulation of the evacuation operation and the manning of evacuation traffic controlpoints. During the exercise, simulated traffic problems will be presented to field personnel formitigation by using IAP procedures identified through yearlong training.All evacuation routes are planned toprovide lane continuity. For example, atmajor intersections or other transitionpoints, two lanes will transition to twolanes and not be reduced to one.However, there are some exceptions assome roads are not wide enough toaccommodate such continuity. There isextensive use of static traffic controldevices (cones, barricades, etc.) and lawenforcement personnel when a lanereversal is employed.To aid in the goal of lane continuity,SCDOT has employed ITS technology toits maximum advantage along evacuationroutes. Further SCDOT has instigated theuse of ICS/IAP procedures to maximizeoperational efficiency and has assuredsound, logical communications protocolduring hurricane events.Figure SC-1. Aerial view of I-26 near Columbia,SC where 100-mile evacuation reversal isterminated.Transportation Outcome(s): The growing number of permanent residents within fifty miles of thecoast and the high number of tourists that visit the coast each year during hurricane seasonmotivate SCDOT to provide safe, effective evacuation operations. The coastal access roadsystem has not kept pace with the population growth – only minor traffic capacity improvementshave been made in the last forty-five years. This combination of constrained road system andhigh population makes it imperative that the maximum traffic capacity is achieved duringevacuation events.The new ICS is paying many dividends in its simplicity, concise instruction and adaptiveflexibility. Stakeholders and the public have realized the benefits accruing to them through thiscooperative framework and periodic review process. The current initiative represents the state’sbest efforts to protect the public when a hurricane threatens the coast. SCDOT is prepared forevacuations but will continue to evaluate yearly and improve as resources permit.Implementation Issues: Two implementation issues of the state’s evacuation plans areavailability of evacuation routes and appropriate signage along those routes. The SCDOT andSCHP assess all routes in the field yearly to ensure evacuation signage is in place. Also,evacuation routes are altered if needed during the yearly assessment.64