Flipbook

1. PAGE 1
PREPARED FOR THE VIRGINIA DEPARTMENT OF TRANSPORTATION, CENTRAL REGION OPERATIONS
JUNE 2015
INTERSTATE 95/295
OPERATIONS CONCEPTS
INTERSTATE 95/295
OPERATIONS CONCEPTS

2. PAGE 2
Interstate 95/295 Operations Concepts
Prepared For:
Virginia Department of Transportation, Central Region Operations
2430 Pine Forest Drive
Colonial Heights, VA 23834
(804) 524-6000
Prepared By:
Kittelson & Associates, Inc.
1850 Centennial Drive, Suite 130
Reston, Virginia 20191
(703) 885-8970
June, 2015
Kittelson & Associates, Inc.
Associate Engineer

3. PAGE 3
PROJECT STUDY OVERVIEW
PROJECT CATALYST
• Merging, weaving, and lane drops have degraded
operational and safety performance for freeway users
STUDY OBJECTIVES
• Develop planning-level concept configurations that:
–– Minimize required reconstruction/ROW acquisitions
–– Reduce merge/weave conflicts
–– Improve lane continuity
–– Improve operational and safety performance
• Establish cost magnitudes for each concept
• Assess benefits and value of possible investments

4. PAGE 4
STUDY LOCATIONS
THREE STUDY LOCATIONS:
LOCATION 1
Segment 1: I-95 NB between I-295 and SR 656 (Sliding Hill Rd)
Segment 2: I-95 NB between SR 656 (Sliding Hill Rd) and SR 802 (Lewistown Rd)
LOCATION 2
I-95 SB between SR 656 (Sliding Hill Rd) and I-295
1
802
656

5. PAGE 5
LOCATION 1 – SEGMENT 1
EXISTING CONDITIONS
• Mainline lane drop on I-95 reduces capacity limitations
• Dropping mainline creates inconsistency in the number
of basic lanes
• I-295 is a left-hand entrance to I-95
• Weaving is created between I-295 and SR 656 (Sliding
Hill Road)
• Sufficient existing pavement on I-295 to carry three lanes
northbound through merge with I-95 NB
I-95 NB BETWEEN I-295 AND SR 656 (SLIDING HILL ROAD)
From I-295
Outer Loop

6. PAGE 6
EXISTING
LOCATION 1 – SEGMENT 1I-95 NB BETWEEN I-295 AND SR 656 (SLIDING HILL ROAD)
I-95 NB
I-95 NB
Single
contiguous lane
on I-95 NB
Three lane
Entrance
Two lane
Exit
To Sliding
Hill Rd
From
I-295 WB
OPTION 1
• Creates three-lane
entrance from I-295
• Creates auxiliary lane
between I-95 and
SR 656
• Creates 2-lane exit to
SR 656
OPTION 2
• Creates third NB lane
from I-95
• Creates auxiliary lane
between I-95 and SR
656
• Creates 2-lane exit to
SR 656
I-95 NB
I-95 NB
Two contiguous
lanes on I-95
NB
Third NB
lane
continued
Two lane
Exit
From
I-295 WB
To Sliding
Hill Rd
I-95 NB
I-95 NB
Single
contiguous lane
on I-95 NB
Three lane
Entrance
Two lane
Exit
To Sliding
Hill Rd
From
I-295 WB
I-95 NB
I-95 NB
Single
contiguous lane
on I-95 NB
Three lane
Entrance
Two lane
Exit
To Sliding
Hill Rd
From
I-295 WB
From I-295
Outer Loop
From I-295
Outer Loop
From I-295
Outer Loop

7. PAGE 7
FEATURES
• Uses existing pavement
• Increases capacity from I-295 at merge point
• Increases number of lanes in weaving section
• Two-lane exit to Sliding Hill decreases lane changing
DISADVANTAGES
• Does not provide basic lane continuity on I-95 NB
IMPLEMENTATION
• $4.3 Million
• Longer construction zone/timeline due to restriping that
extends over two miles south of the I-95/I-295 merge
• New signage on both I-95 and I-295
= Existing Lanes
= New Striping
Sheet one of two
LOCATION 1 – SEGMENT 1 - OPTION 1I-95 NB BETWEEN I-295 AND SR 656 (SLIDING HILL ROAD)
Refer to Appendix A for full-size taping.

8. PAGE 8
FEATURES
• Uses existing pavement
• Increases capacity from I-295 at merge point
• Increases number of lanes in weaving section
• Two-lane exit to Sliding Hill decreases lane
changing
DISADVANTAGES
• Does not provide basic lane continuity on I-95 NB
IMPLEMENTATION
• $4.3 Million
• Longer construction zone/timeline
• New signage on both I-95 and I-295
= Existing Lanes
= New Striping
Sheet two of two
LOCATION 1 – SEGMENT 1 - OPTION 1I-95 NB BETWEEN I-295 AND SR 656 (SLIDING HILL ROAD)
Refer to Appendix A for full-size taping.

9. PAGE 9
FEATURES
• Creates lane continuity on I-95 mainline
• Increases capacity of I-95 at merge point
• Increases number of lanes in weaving section
• Provides two-lane exit to Sliding Hill via an option lane
• New pavement utilizes existing ROW
DISADVANTAGES
• Requires additional pavement
IMPLEMENTATION
• $4.6 Million
• New signage only required on I-95
= Existing Lanes
= New Striping
= New Pavement
LOCATION 1 – SEGMENT 1 - OPTION 2I-95 NB BETWEEN I-295 AND SR 656 (SLIDING HILL ROAD)
Refer to Appendix A for full-size taping.

10. PAGE 10
OPTION 1
• No new pavement required
• Longer construction timeline
• Longer construction zone
OPTION 2
• Requires new pavement
• Shorter construction timeline
• Greater environmental impact
Key Cost Differences
Item Option 1 Option 2 Difference
Paving $760,000 $915,000 +$155,000
MOT and Construction Barrier $175,000 $125,000 -$50,000
Signing $345,000 $315,000 -$30,000
Water Quality $75,000 $150,000 +$75,000
Preliminary Engineering $430,000 $570,000 +$140,000
Cost of Listed Items $1,785,000 $2,075,000 $290,000
Overall Project Cost $4,290,000 $4,595,000 $305,000
LOCATION 1 – SEGMENT 1 - COSTINGI-95 NB BETWEEN I-295 AND SR 656 (SLIDING HILL ROAD)
Refer to Appendix C for detailed
breakdown of costs (mill/overlay vs.
new pavement, etc.)

11. PAGE 11
EXISTING CONDITIONS
• Mainline lane drop on I-95 reduces capacity.
• Dropping mainline creates inconsistency in the number
of basic lanes
• NB on ramp from Sliding Hill Road loads right lane as
left lane is dropping
656
I-95 NB
I-95 NB
Mainline lane
drop and merge
located in close
proximity
To
Lewistown Rd
From
Sliding
Hill Rd
LOCATION 1 – SEGMENT 2I-95 NB BETWEEN SR 656 (SLIDING HILL ROAD) AND SR 802 (LEWISTOWN ROAD)

12. PAGE 12
From
Sliding
Hill Rd
From
Sliding
Hill Rd
From
Sliding
Hill Rd
I-95 NB
I-95 NB
Mainline lane
drop and merge
located in close
proximity
To
Lewistown Rd
I-95 NB
I-95 NB
Mainline lane
drop downstream
of exit
To
Lewistown Rd
I-95 NB
I-95 NB
No mainline
lane drop
Outside lane
becomes
trap lane
To
Lewistown Rd
EXISTING OPTION 1
• Shifts mainline lane
drop downstream of
exit to SR 802
OPTION 2
• Inside lane on mainline
is not dropped
• Outside lane forced to
exit at SR 802
LOCATION 1 – SEGMENT 2I-95 NB BETWEEN SR 656 (SLIDING HILL ROAD) AND SR 802 (LEWISTOWN ROAD)

13. PAGE 13
FEATURES
• Extends lane drop beyond merging influence
area
• Sets up future northbound lane extension
• Utilizes existing ROW
• Requires median closure
DISADVANTAGES
• Does not provide basic lane continuity on I-95
NB
IMPLEMENTATION
• $7.8 Million
• “Straightforward” planning and construction
–– Inside lane extension has minimal impact on
adjacent lanes
802
LOCATION 1 – SEGMENT 2 - OPTION 1I-95 NB BETWEEN SR 656 (SLIDING HILL ROAD) AND SR 802 (LEWISTOWN ROAD)
Refer to Appendix A for full-size taping.

14. PAGE 14
FEATURES
• Provides left lane continuity
• Shifts mainline lanes to the outside
• Traps right lane to exit
• Utilizes existing ROW
• Requires median closure
DISADVANTAGES
• Lane drop on right
• Does not set up future NB fourth lane
IMPLEMENTATION
• $5.9 Million
• More complex to construct
–– Inside lane extension plus shift of all
adjacent lanes
802
LOCATION 1 – SEGMENT 2 - OPTION 2I-95 NB BETWEEN SR 656 (SLIDING HILL ROAD) AND SR 802 (LEWISTOWN ROAD)
Refer to Appendix A for full-size taping.

15. PAGE 15
OPTION 1
• Larger quantities of new pavement
required
• Longer construction timeline
• Longer construction zone
OPTION 2
• Shorter construction timeline
• Lower environmental impact
Key Cost Differences
Item Option 1 Option 2 Difference
Paving $2,645,000 $1,905,000 -$740,000
Roadway Barrier $475,000 $350,000 -$125,000
Construction Services $1,700,000 $1,285,000 -$415,000
Preliminary Engineering $805,000 $620,000 -$185,000
Cost of Listed Items $5,625,000 $4,160,000 $1,465,000
Overall Project Cost $7,700,000 $5,915,000 -$1,785,000
LOCATION 1 – SEGMENT 2 - COSTINGI-95 NB BETWEEN SR 656 (SLIDING HILL ROAD) AND SR 802 (LEWISTOWN ROAD)
Refer to Appendix C for detailed
breakdown of costs (mill/overlay vs.
new pavement, etc.)

16. PAGE 16
EXISTING CONDITIONS
• Both lanes merge from Sliding Hill Road entrance
• Single lane left exit to I-295
• Adding lanes to outside of I-295 exit does not add
capacity at the diverge point
LOCATION 2I-95 SB BETWEEN SR 656 (SLIDING HILL RD) AND I-295
I-95 SB
I-95 SB
I-295 SB
Lane additions
do not increase
capacity
From
Sliding
Hill Rd
To I-295
Inner Loop

17. PAGE 17
Continuation of
entrance lanes
Center lane
becomes option lane
Center lane
becomes option lane
From
Sliding
Hill Rd
From
Sliding
Hill Rd
I-95 SB I-95 SB I-95 SB
I-95 SB
I-295 SB
I-95 SB
I-295 SB
I-95 SB
I-295 SB
Lane additions
do not increase
capacity
From
Sliding
Hill Rd
EXISTING OPTION 1
• Shifts mainline lane
drop downstream
of exit to SR 802
• Middle lane acts as
an option lane
OPTION 2
• Option lane
provided
• Only outside lane
from SR 656 has a
forced merge
LOCATION 2I-95 SB BETWEEN SR 656 (SLIDING HILL RD) AND I-295
To I-295
Inner Loop
To I-295
Inner Loop
To I-295
Inner Loop

18. PAGE 18
FEATURES
• Requires fewest number of lane-changing maneuvers
• Develops traditional exit
• Carries additional capacity through diverge point
DISADVANTAGES
• Requires additional pavement
• Introduces ROW/constructability challenges
IMPLEMENTATION
• $7.3 Million
• Considerable planning and construction phases
LOCATION 2 - OPTION 1I-95 SB BETWEEN SR 656 (SLIDING HILL RD) AND I-295
Refer to Appendix A for full-size taping.

19. PAGE 19
FEATURES
• Requires fewer lane-changing maneuvers than
existing condition
• Creates lane balance
• Carries additional capacity through diverge point
• Requires no additional pavement
DISADVANTAGES
• Requires more lane changes than Option 1
• Increase in capacity not as large as in Option 1
IMPLEMENTATION
• $1.9 Million
• “Straightforward” planning and construction phases
LOCATION 2 - OPTION 2I-95 SB BETWEEN SR 656 (SLIDING HILL RD) AND I-295
Refer to Appendix A for full-size taping.

20. PAGE 20
OPTION 1
• New pavement required
• Longer construction time-line
• Minor ROW impact
OPTION 2
• No new pavement required
• No ROW impacts
• Lower environmental impact
Key Cost Differences
Item Option 1 Option 2 Difference
Paving $1,950,000 $405,000 -$1,545,000
Roadway Barrier $145,000 -- -$145,000
Drainage $250,000 -- -$250,000
Water Quality $270,000 $75,000 -$195,000
Right of Way & Utilities $200,000 -- -$200,000
Preliminary Engineering $850,000 $285,000 -$565,000
Cost of Listed Items $3,665,000 $765,000 $2,900,000
Overall Project Cost $7,320,000 $1,945,000 -$5,375,000
LOCATION 2 - COSTINGI-95 SB BETWEEN SR 656 (SLIDING HILL RD) AND I-295
Refer to Appendix C for detailed
breakdown of costs (mill/overlay vs.
new pavement, etc.)