Location: San Antonio, TX
The primary objective is to provide congestion relief along Harry Wurzbach and at the Eisenhauer intersection while providing access and connectivity to Austin Hwy. The existing grade separated intersection has zero connectivity and forces vehicles to either drive through parking lots or use the five-legged Eisenhauer intersection. This intersection is inefficient and creates delay due to the high number of left-turning traffic that requires separate signal phases and stops all other traffic. The reduced amount of green time available to Harry Wurzbach significantly reduces capacity from the northbound and southbound approaches.
A previous study proposed a grade separated intersection at Eisenhauer Road in addition to the entrance and exit ramps connecting to Austin Hwy at a cost of an estimated $22M. While the delay along Harry Wurzbach is reduced, the proposed improvements neglected Eisenhauer and Austin Hwy. As proposed, the Eisenhauer intersection would have two signalized intersections that, due to their spacing and phasing, would be inefficient. If the NB Harry Wurzbach frontage road has full access at the Eisenhauer intersection it will create inefficiencies and the level of service (LOS) at the intersection will suffer.
The CEC team developed an alternative design: four ramps connecting Harry Wurzbach and Austin Highway, and controlling this intersection with a Single Point Urban Intersection (SPUI). The SPUI accomplishes the project objectives at a lower cost, shorter construction duration and less traffic disturbance.
In close coordination with CoSA, TXDOT, special interest groups, local businesses and residents, CEC’s design encompassed:
- SPUI Geometric Design
- Pedestrian and bicycle elements that meet ADA and provided safe access using innovative technologies including:
- Pedestrian detection
- Mid-Block “Z” Crossings
- Bike Signal
- Protected bike lanes
- 18-month reduction in construction duration.
- Cost savings of nearly $5M