HOW A DDI WORKS FOR FURTHER INFORMATION INTRODUCTION PURPOSE AND NEED A diverging diamond interchange (DDI) is unique from a standard diamond On behalf of the Pennsylvania Department of Transportation (PennDOT), we would like The primary purpose of the project is to improve safety within the project limits while maintaining or improving current to welcome you to this meeting to share the proposed improvements at the SR 322 and and future traffic operations and accommodating all modes of transportation utilizing the SR 322 corridor. interchange in that traffic on the minor road (SR 322) crosses to the left side of the road PennDOT Project Manager at signalized intersections prior to the major road (SR 222). This allows for direct left SR 222 Interchange located in Ephrata and West Earl Townships. Dave Fratangeli | Project Manager Improve Safety (Primary) Maintain or Improve Traffic Congestion (Secondary) turns to/from the SR 222 ramps. Traffic on the minor road (SR 322) crosses back to the PA Department of Transportation, District 8 PennDOT District 8-0 and the Lancaster County Planning Commission completed a Road • Reduce the number of conflict points • Provide dedicated turn lanes right side of the road at the far side signalized intersection. Highway Design Unit Safety Audit (RSA) of SR 322 from Ridge Avenue to the SR 222 Interchange in July 2013. • Eliminate mainline left-turn/through conflict (existing crash data indicates 43% • Decrease queue spillback 2140 Herr Street • Harrisburg, PA 17103 The RSA identified several safety improvements and suggested consideration be given angle crashes & 43% rear end crashes) The DDI configuration has several safety and operational advantages over a standard Maintain or Improve Multimodal Accommodations (Secondary) 717-705-6176 to reconstructing the SR 322 and SR 222 interchange. As a follow-up to the RSA, a study diamond interchange. Due to the crossover path along the minor road, there are fewer [email protected] • Reduce the number of and severity of future crashes (existing crash data was completed in December 2013 to investigate the potential for replacing the existing • Improve sidewalk connectivity along SR 322 crossing (and total) conflict points than a standard diamond interchange which reduces indicates 46% of crashes resulted in injuries) the crash rate and potential for high severity crashes. The configuration of the DDI only diamond interchange with a Diverging Diamond Interchange (DDI) and a subsequent • Provide provision for bicycles and horse & buggies requires 2 phases per signal cycle versus 3 phases in a standard diamond interchange. alternatives analysis was completed in December 2016. This allows the DDI to provide more green time to traffic which leads to an increase in Design Project Manager overall capacity and can mitigate the potential for congestion. Rob Wills, P.E. | Associate Whitman, Requardt & Associates, LLP As of July 2017, 89 diverging diamond interchanges (DDIs) have been opened to traffic in 224 St. Charles Way, Suite 140 • York, PA 17402 PRELIMINARY DDI DESIGN DDI BENEFITS the United States. Pennsylvania’s first DDI opened to traffic in September 2016 at the I-70 717-741-5057 and SR 19 interchange near Washington, PA, southwest of Pisburgh. Several other DDIs [email protected] Substantially reduces the number of conflicts compared to the tight diamond are in design throughout the state including the I-8365Ǭ65 Exit 4 Interchange in York County PROJECT TIMELINE interchange points, improving safety. and SR 422/Penn Street Interchange in Berks County.Interchange Improvements Project Substantially reduces the number of crossing conflicts between left-turn and through movements, reducing the likelihood for angle and head on crash types which tend to result in significant injuries Reamstown Only requires two phase traffic signals with short cycle lengths, reducing delay for 272 both motorized and non-motorized users. Significantly increases the capacity of left and right turning movements to and PROJECT TIMELINE from the ramps. SR 322/SR 222 INTERCHANGE IMPROVEMENTS Ephrata PROJECT LOCATION Significantly beer at handling left turn movements under the SR 222 bridges. PennDOT has decided to move forward with the design and implementation of the Maintains a similar footprint to existing conditions with minor right-of-way needs. diverging diamond interchange. This project option will be progressed through Lititz Akron Has beer performance and offers lower delays, fewer stops, lower stop time and preliminary engineering, final design,PennDOT right-of-way, has utility decided clearance, toand construction.move forward with the design and implementation of the shorter queue lengths when compared to the performance of the conventional diverging diamond interchange. This project alternative will be progressed through diamond design. 501 SUHOLPLQDU\HQJLQHHULQJƬQDOGHVLJQULJKWRIZD\XWLOLW\FOHDUDQFHDQGFRQVWUXFWLRQ SR 0322 / 0222 Project Improvements Interchange Please note that dates shown below are subject to change based uponBrownstown funding, NOTE: Dates shown below aredevelopment subject to change based of design, upon and permitting approvals. funding, development of design, and permiing approvals. New Holland Leola 272 2017 2018 2019 2020 LaLancancaster 340 PRELIMINARY ENGINEERING FINAL DESIGN 5,*+7ǫ2)ǫ:$< UTILITY CLEARANCE CONSTRUCTION HOW A DDI WORKS FOR FURTHER INFORMATION INTRODUCTION PURPOSE AND NEED A diverging diamond interchange (DDI) is unique from a standard diamond On behalf of the Pennsylvania Department of Transportation (PennDOT), we would like The primary purpose of the project is to improve safety within the project limits while maintaining or improving current to welcome you to this meeting to share the proposed improvements at the SR 322 and and future traffic operations and accommodating all modes of transportation utilizing the SR 322 corridor. interchange in that traffic on the minor road (SR 322) crosses to the left side of the road PennDOT Project Manager at signalized intersections prior to the major road (SR 222). This allows for direct left SR 222 Interchange located in Ephrata and West Earl Townships. Dave Fratangeli | Project Manager Improve Safety (Primary) Maintain or Improve Traffic Congestion (Secondary) turns to/from the SR 222 ramps. Traffic on the minor road (SR 322) crosses back to the PA Department of Transportation, District 8 PennDOT District 8-0 and the Lancaster County Planning Commission completed a Road • Reduce the number of conflict points • Provide dedicated turn lanes right side of the road at the far side signalized intersection. Highway Design Unit Safety Audit (RSA) of SR 322 from Ridge Avenue to the SR 222 Interchange in July 2013. • Eliminate mainline left-turn/through conflict (existing crash data indicates 43% • Decrease queue spillback 2140 Herr Street • Harrisburg, PA 17103 The RSA identified several safety improvements and suggested consideration be given angle crashes & 43% rear end crashes) The DDI configuration has several safety and operational advantages over a standard Maintain or Improve Multimodal Accommodations (Secondary) 717-705-6176 to reconstructing the SR 322 and SR 222 interchange. As a follow-up to the RSA, a study diamond interchange. Due to the crossover path along the minor road, there are fewer [email protected] • Reduce the number of and severity of future crashes (existing crash data was completed in December 2013 to investigate the potential for replacing the existing • Improve sidewalk connectivity along SR 322 crossing (and total) conflict points than a standard diamond interchange which reduces indicates 46% of crashes resulted in injuries) the crash rate and potential for high severity crashes. The configuration of the DDI only diamond interchange with a Diverging Diamond Interchange (DDI) and a subsequent • Provide provision for bicycles and horse & buggies requires 2 phases per signal cycle versus 3 phases in a standard diamond interchange. alternatives analysis was completed in December 2016. This allows the DDI to provide more green time to traffic which leads to an increase in Design Project Manager overall capacity and can mitigate the potential for congestion. Rob Wills, P.E. | Associate N Whitman, Requardt & Associates, LLP 65Ǭ65 Interchange Improvements Project DIVERGING DIAMOND INTERCHANGE As of July 2017, 89 diverging diamond interchanges (DDIs) have been opened to traffic in 224 St. Charles Way, Suite 140 • York, PA 17402 PRELIMINARY DDI DESIGN DDI BENEFITS the United States. Pennsylvania’s first DDI opened to traffic in September 2016 at the I-70 717-741-5057 and SR 19 interchange near Washington, PA, southwest of Pisburgh. Several other DDIs [email protected] Substantially reduces the number of conflicts compared to the tight diamond are in design throughout the state including the I-83 Exit 4 Interchange in York County Walmart interchange points, improving safety. and SR 422/Penn Street Interchange in Berks County. N Ǫ Substantially reduces the number of crossing conflicts between left-turn and LCBC D through movements, reducing the likelihood for angle and head on crash types A O Bergstrasse which tend to result in significant injuries R Evangelical Lutheran N Only requires two phase traffic signals with short cycle lengths, reducing delay for W Church both motorized and non-motorized users. O T Significantly increases the capacity of left and right turning movements to and S PROJECT TIMELINE N from the ramps. NORTH Turkey H Hill A Significantly beer at handling left turn movements under the SR