city of redlands redlands boulevard/alabama street/ colton avenue revision to intersection

City of RedlandsCity of Redlands

Redlands Boulevard/Alabama Street/Redlands Boulevard/Alabama Street/Colton AvenueColton Avenue

Revision to IntersectionRevision to IntersectionImprovement PlansImprovement Plans

January 17, 2012January 17, 2012

WhatWhat’’s the Problem?s the Problem?

• N-S lanes are offset by 22 feet through the Alabama St./ Redlands Blvd. intersection.

• Traffic demands exceed the capacity of the intersection during peak hours.

• Unorthodox merge/intersection of Colton Ave. / Redlands Blvd.

Traffic Pattern TerminologyTraffic Pattern Terminology“LOS” – Level of Service (Capacity vs. Demand)

Ranges from A to F

LOS “A” – Free Flowing Traffic

LOS “C” – Occasional Traffic Restrictions

LOS “F” – Jammed Traffic Condition

SolutionsSolutions• Improve the intersection geometry of Redlands

Boulevard/Alabama Street (removes 22-foot offset).

• Improves vehicle traffic flow through intersections from a LOS “F” to LOS “C”.

• Create a signalized T-intersection for Colton Avenue/Redlands Boulevard.

Solutions (cont.)Solutions (cont.)• Incorporate value engineering to reduce

property acquisition and construction costs.

• Proposed improvements be constructed as single phase, instead of multiple phases.

ComparisonComparison

Present day

ComparisonComparison

Value Engineered Design

Value Engineered Design

(LOS “C” thru 2025)

ComparisonComparison

Present Day (LOS “F”)

Comparison - overhead viewComparison - overhead view

Present day

Comparison - overhead viewComparison - overhead view

Value Engineered Design

• By reducing a single South-bound lane a significant portion new ROW from the northeast corner will no longer be necessary.

• LOS will remain at “C” for peak hours until year 2025 rather than 2027.

Value EngineeringValue Engineering

Property Acquisition Reduction Property Acquisition Reduction Implementing Value EngineeringImplementing Value Engineering

Colton Ave./ Redlands Blvd.And

Alabama St./ Redlands Blvd.

Intersections

Ultimate Design*

Value Engineering

Design**

Cost Savings

Total $ 9,911,233 $ 8,659,447 $1,251,786

Estimated Cost and Time Estimated Cost and Time SavingsSavings

3 years reduction in time until construction

*5 lanes for all approaches at Alabama/ Redlands Blvd.**4 lanes for south-bound approach at Alabama/ Redlands Blvd.

• Authorize staff to proceed forward with the Value Engineered Design for the Redlands / Alabama / Colton intersection improvement project (LOS “C” - 2025).

• Authorize engineering service amendment with Parsons Brinckerhoff to prepare revised plans and specifications to implement the Proposed Value Engineered Design.

RecommendationRecommendation