US 1 Road Diet, Resurfacing and I-695 Improvements
Arbutus, MD
AMT is providing transportation design services for proposed “road diet”, access and capacity improvements along US 1 and I-695 Inner Loop corridors. These improvements along US 1 will provide more direct local and commuter access to the I-695 Inner Loop from US 1 (Southwestern Boulevard) and reduce traffic on local streets by relocating the terminus of an existing on-ramp to I-695 from Leeds Avenue to US 1. Commuter traffic is largely generated by the 770-space Halethorpe MARC Station, which is located along US 1. The design includes pedestrian and bicycle upgrades which will improve non-vehicular access and safety along the US 1 corridor. AMT prepared the SWM Report, the project TMP, and the Interstate Access Point Approval Report for FHWA review. Specific services include:
- Traffic Engineering Analyses – Collected existing traffic data (turning movement counts and volume counts) and forecasted volumes to the years 2015 No-Build, conducted existing and future traffic analysis reporting. Performed Synchro, HCS, and Corsim analysis and prepared an Interchange Access Point Approval (IAPA) report for ramp terminus modification; performed maintenance of traffic alternative analysis (MOTAA); and preparing a Transportation Management Plan (TMP) for the entire project, including I-695 widening.
- Roadway and Streetscape Design – Design drawings were prepared showing road diet along US 1 to make the roadway one lane in each direction, existing median left turn lane will be converted to median bioswales and outside lane along southbound US 1 will be overlaid to meet AASHTO Super elevation criteria. Improvements were designed for sidewalks/sidewalk ramps conforming ADA design guidelines; bicycle lanes were provided along southbound roadway per MDSHA design guidelines. Finalized SWM for the entire stretch of I-695 widening and US 1 improvement, and storm drain design, including median bioswales. Developed multi-stage MOT plans, erosion and sediment control plans, storm drain plans/profiles and roadway profiles, and cross sections showing all the proposed improvements along US 1 and Ramp 8. Advertisement plans have been submitted, and construction anticipated for Spring 2015.
- Environmental Permits – Preparing environmental permits for the entire project to include the work along I-695 and US 1. Determining impacts to Waters of the US and 100-year floodplain; preparing impact plates, impact matrix, and application forms; and preparing report of existing conditions specifying Waters of the US type, soil maps, NWI map, and FEMA map.
- Cost Estimate – Computed the cost estimate for proposed improvements along the US 1 corridor, realigned ramp, and associated repairs of the roadway assets for the semi-final Advertisement design phases. Utilized current market value prices for construction materials and based unit prices on calculated quantities.
AMT is providing transportation design services for proposed “road diet”, access and capacity improvements along US 1 and I-695 Inner Loop corridors. These improvements along US 1 will provide more direct local and commuter access to the I-695 Inner Loop from US 1 (Southwestern Boulevard) and reduce traffic on local streets by relocating the terminus of an existing on-ramp to I-695 from Leeds Avenue to US 1.