US 1 Road Diet, Resurfacing and I-695 Improvements
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.