traffic barrier guidelines other considerations hands-on workshop iii july 2013 1
DESCRIPTION
Combining Areas of Concern Case 1 When the two AOC’s are generally at the same station, but with different offsets. AOC 1AOC 2 AOC further from the roadway will result in the longer length of need. 3TRANSCRIPT
Traffic Barrier Guidelines Other Considerations
Hands-On Workshop IIIJuly 2013
1
Starts at the Site Visit
AOC 1
Identify AOC’s1. Bridge Pier2. Bridge Cone3. Light Pole4. Control Cabinet5. Sign Electric Panel6. Sign Foundation7. Sign Panel8. Trees
AOC 2
AOC 3
AOC 4
AOC 5
AOC 6
2
How to address the area overall?
AOC 7
AOC 8
Combining Areas of Concern Case 1
When the two AOC’s are generally at the same station, but with different offsets.
AOC 1 AOC 2
AOC further from the roadway will result in the longer length of need.
3
Combining Areas of Concern Case 2
When a fixed object is located in the midst of a long slope AOC.
V
H
1: 2.5 (V:H)
4
The slope AOC will control the length of need.
Barrier Installation Conflicts
Retaining Wall Conflict• Last six posts for Traffic Barrier Terminal Type T6 were omitted.
Retaining wall design and location could have eliminated the conflicts.
5
Barrier Installation Conflicts
Drainage Structure Conflict:Last two posts for Traffic Barrier Terminal Type T6 were omitted.
6
Traversable Element
7
Traversable Element
8
Barrier Clearance Distance
9
Barrier Terminal Connection
10
Drainage Structure Conflict
11
Parapet or Concrete Barrier Contributes Toward the LON.
12
AOC #1-Bridge Parapet
AOC #2-Waterway
AOC #1-LONAOC #2-LON
Bridge parapet contributes towards the shielding for AOC #2
Runoff Path
Area of Concern
NID
13
Runoff Path
14
AOC #1
AOC #2
Runoff Path
15
AOC #1
AOC #2
LR
x
Y
Runoff Path
16
AOC #1
AOC #2
LR
Speed Profile-Ramp Entrance
Service Interchange
30 mph20 mph
Speed Profile-Mainline Exit
• Directional-50 mph minimum (applies to sharpest curve) Ramp with a design speed of 50 mph or greater on which vehicles do not stop.
Service Interchange
50 mph
60 mph
Questions?
19
