Garden State Parkway Interchange 98
Preliminary and Final design services for the widening of two (2) miles of the GSP both northbound (NB) and southbound (SB) at interchange 98. The purpose of the project was to add a fourth lane and full shoulders to eliminate a bottleneck. The GSP both north and south of this location has four (4) lanes. Two overhead sign structures were added on the NB approach, acceleration and deceleration lanes were extended, guiderail was upgraded to current standards, highway lighting was added to the Route 34 entrance ramp, utility relocations, and milling and resurfacing of existing lanes.
The key elements associated with this project included survey and mapping, topographic survey, highway design, geotechnical engineering, hydraulics and hydrology engineering, staging and maintenance and protection of traffic, drainage design, traffic engineering, utility relocations, lighting and signage and environmental permitting.
The highway design utilized both NJDOT and NJTA standards and involved roadway geometry, superelevation, profiles, and cross sections for both the mainline and three ramps.
Due to the added impervious coverage, the drainage design was required to meet the NJDEP Stormwater Management Regulations. The drainage design included drainage area calculations, pipe sizing calculations, spread calculations, and stormwater management design including the design of three (3) detention basins. The drainage design was approved by the NJDEP.