Work Zone Mobility and Safety Program

E. Sample Appendices – Minor-to-Moderate Impacts (Sample TMP 1)

A. Operational Analysis Summary

B. Temporary Traffic Control Plans (Sample)

C. Post Project Evaluation Report

A. Operational Analysis Summary

Operational Analysis

Data Collection and Modeling Approach – The study team collected a wide range of geometric, traffic flow, traffic control, and operational data elements. Annual Average Daily Traffic (AADT) values were obtained from DDOT 2007 Traffic Volumes Map. This data was projected by using 1 percent growth factor to obtain the future conditions, 2008 AADT. Turning movement counts were conducted at five locations (shown in Figure: 1) to understand the traffic flow characteristics.

  • Benning Road/Minnesota Avenue, NE.
  • Benning Road/E. Capitol Street, NE.
  • Minnesota Avenue/E. Capitol Street/Ames Street, NE.
  • 17th Street SE /Independence Avenue, SE.
  • 21st Street NE/C Street, NE.

Existing Traffic Operations – There are 33 signalized intersections (see below) within the study area. The Synchro file for the influence area was obtained from DDOT.

  • 17th Street/ Benning Road, NE.
  • 17th Street/Gales Street, NE.
  • 17th Street/D Street, NE.
  • 17th Street/ C Street, NE.
  • 17th Street/Constitution Avenue, NE.
  • 17th Street/E. Capitol Street, NE/SE.
  • 17th Street/ Independence Avenue SE.
  • 18th Street/C Street, NE.
  • 19th Street/ Benning Road, NE.
  • 19th Street/E Street, NE.
  • 19th Street/C Street, NE.
  • 19th Street/E Capitol Street, NE.
  • 19th Street/Independence Avenue, SE.
  • E. Capitol Street/22nd Street/ RFK Stadium, NE.
  • E. Capitol Street/22nd Street/ RFK Stadium, SE.
  • 21st Street/ Benning Road, NE.
  • 21st Street/ C Street, NE.
  • 24th Street/ Benning Road, NE.
  • 26th Street/Benning Road, NE.
  • Oklahoma Avenue/ Benning Road, NE.
  • Minnesota Avenue/Benning Road, NE.
  • Minnesota Avenue/Grant Road, NE.
  • Minnesota Avenue/Ames Street/E. Capitol Street, NE.
  • Minnesota Avenue/Ridge Road, NE.
  • Minnesota Avenue/B Street, SE.
  • E. Capitol Street/ Stoddert Place, SE.
  • Minnesota Avenue/Dix Street, NE.
  • Benning Road/Anacostia Avenue, NE.
  • Benning Road/34th Street, NE.
  • Benning Road/42nd Street, NE.
  • Benning Road/44th Street, NE.
  • Benning Road/E. Capitol Street/Central Avenue, NE.
  • E Capitol Street/Texas Avenue, SE.

Crash History – Crash history of the influence area indicates a very high percentage of rearend and sideswipe crashes, followed by right-angle crashes. Table 2, below, provides a summary of crashes for the period 2004 to 2006.

Table 1: Summary of Crashes for the Period 2004 to 2006
Crash Type Crash Count Percentage Crash Count Percentage
Benning Road NE
from Anacostia Avenue NE
to E. Capitol Street, NE
Influence Area,
Shown in Figure 1
Right Angle 58 11.46 157 9.78
Left Turn, Hit Vehicle 47 9.29 124 7.73
Right Turn, Hit Vehicle 9 1.78 32 1.99
Rear End 174 34.39 449 27.98
Sideswipe 131 25.89 410 25.55
Head On 10 1.98 47 2.93
Parked Vehicle 11 2.17 97 6.04
Fixed Object 14 2.77 74 4.61
Run-Off-Road 0 0.00 8 0.50
Left Turn, Hit Pedestrian 3 0.59 8 0.50
Right Turn, Hit Pedestrian 2 0.40 8 0.50
Backing, Hit Pedestrian 2 0.40 5 0.31
Straight, Hit Pedestrian 15 2.96 64 3.99
Backing, Hit Parked Vehicle 3 0.59 16 1.00
Backing, Hit Moving Vehicle 3 0.59 11 0.69
Backing, Hit Stopped Vehicle 5 0.99 14 0.87
Non-Collision Accident 4 0.79 5 0.31
Other 15 2.96 76 4.74

Based on the crash history, it is recommended that all intersections be monitored throughout construction for an increase in crashes resulting from work zone implementation. In particular, special attention should be paid to Benning Road where it intersects with:

  1. Oklahoma Avenue, NE.
  2. Anacostia Avenue, NE.
  3. 34th Street, NE.
  4. Minnesota Avenue, NE.
  5. 42nd Street, NE.
  6. E. Capitol Street, NE.

Map of the Benning Road area, with all crashes between 2004 and 2006 marked as well as all 2006 crashes
Figure 1: Crash Map of the Influence Area

Work Zone Impact Assessment

The following assessment includes a brief discussion about how the project is expected to affect the work zone vicinity. This provides an estimate of how traffic demand and traffic patterns are expected to change because of the construction. Also, it gives an idea of areas of potential concerns.


The traffic analysis detailed below helps to assess the impact of the construction phasing on motorists delay and queues.

The Study Team used the DDOT Synchro Model as a basis for developing the traffic model of the project influence area. Traffic analysis was performed for existing and proposed construction conditions. The construction is proposed to take place in five phases, each of which was analyzed independently. The analysis did not consider the sub-phases of any phase. Measures of effectiveness (MOEs) such as level of service (LOS), delays, and queue lengths were reported. Table 2 shows the MOEs for the projected construction traffic for each phase as compared against existing conditions.

Results – While the LOS decrease on some segments, the overall LOS remained acceptable, as Table 2 shows. The analysis also indicates significant delay at Benning Road and Minnesota Avenue for Phase 1, NE (see Table 2 for WB movement information). It is recommended that DDOT review/modify the signal timing as shown below and monitor the intersection throughout the project.

Signal timing diagram showing splits and phases for Benning Road and Minnesota Avenue

As the projected impacts are below DDOT allowable thresholds[1] for arterials, the proposed TMP (MOT, TO, PI&O) may be implemented in line with the recommendation of this analysis. Figure 2 provides an estimate of travel time (Benning Road from 21st Street to E. Capitol Road) by work zone phasing considering unforeseen conditions.

Table 2: Traffic Analysis Summary (Comparison of Existing with Proposed Phasing I-V)
Traffic analysis summary showing MOEs for the projected construction traffic for each phase as compared against existing conditions at nine Benning Road intersection and the 21st Street at C Street intersection Traffic analysis summary showing MOEs for the projected construction traffic for each phase as compared against existing conditions at nine Benning Road intersection and the 21st Street at C Street intersection
Notes: *95th percentile volume exceeds capacity and queues may be longer. R – Dedicated right-turn, L – Dedicated left-turn

Map showing Benning Road from 21st Street to East Capitol Street with travel time comparisons for eastbound and westbound travel during Phases 1 through 5
Figure 2: Travel Time Comparison—Benning Road from 21st Street to E. Capitol Street


Public Transportation – The MOT Plans show bus stop locations affected by lane closures. These and other similarly affected locations must be monitored to minimize public inconvenience and ensure full accessibility. While all bus routes are maintained, they also must be monitored to ensure scheduled viability.

Community Accessibility – The Contractor shall advise residents affected by alley access resulting from temporary closures in writing to take alternative alley egress and ingress. Residents affected by driveway access resulting from temporary closure shall be advised in writing by the contractor to park their vehicles in nearby parking zones. Community meetings are suggested during various stages of the project

Non-motorized Assessment – Temporary crosswalks and all other affected crosswalks and sidewalks, as shown in the MOT plans, must be monitored throughout the construction for safety and full accessibility. All pedestrian temporary provisions must comply with ADA and other District requirements.

Utility – Utility impacts were not included in this analysis.

B. Temporary Traffic Control Plans (Sample)

Only sample TTC plan is included here for reference, to manage the file download size. Generally all the TTC plans are included in TMP.

Construction drawing of reconstruction of Benning Road, N.E. from Anacostia Avenue to 42nd Street, N.E., showing construction measurements and placement of signs and other features.

C. Post Project Evaluation Report

Post Project Evaluation
Describe Areas of the TMP that were Most Successfully Implemented & Why
Describe Areas of the TMP that were Least Successfully Implemented & Why
Summarize/Describe all Changes Necessary to Correct Oversight of the Original TMP
Summarize the Effectiveness of Each Change Made to the TMP
Summarize the Type and Frequency of Legitimate Complaints Received
Describe/Summarize Road User Mobility Impacts Observed During Work
Describe/Summarize Crashes and Incidents that Occurred During the Work
Describe/Summarize Road Safety Impacts Observed During Work
Suggested TMP Improvements or Changes for Future Similar Projects

This completed assessment shall be forwarded to the Project Manager and Team Leader following approval below.

DDOT Project Manager DDOT Team Leader
Signature: Signature:
Name: Name:
Date: Date:

  1. According to DDOT Work Zone Safety and Mobility Policy, for arterials, unacceptable travel delays are those longer than 15 minutes or a traffic queue extending more than 1500 ft on the mainline, beyond what are considered normal for the affected roadway segment.

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