Page 54 - Bridge and Highway Structure Rehabilitation and Repair

CHAPTER 1 OVERVIEW OF BRIDGE ENGINEERING 29

TWO-LANE CLOSED TEMPORARY
DURING CONSTRUCTION CONSTRUCTION ACCESS

X

TEMPORARY ROADWAY DETOUR

Figure 1.11 Diverting traffi c on local roads.

Structural drawings showing construction in each stage should conform to traffi c control
plans.

A set of applicable standard traffic control plans is to be used as a basis for developing the

fi nal traffic control plans. These plans shall be customized to reflect site conditions and the ability

of the shoulder to withstand traffi c.
Plans must comply with MUTCD (Manual on Uniform Traffic Control Devices), Work Zone

Traffic Control Guidelines and AASHTO LRFD specifications. All nonstandard signs shall be

sized according to MUTCD with letter heights and alphabet size given for each line.
If shutting down will result in unacceptable delays from detours and/or if there is too much
local opposition to shutting down, construction needs to be carried out in more than one stage.
1.9.2 Planning for the Maintenance and Protection of Traffi c (MPT)
MPT will be based on a hierarchy of options:
1. Half-width staged construction (shown in Figure 1.12)
2. Schedule nighttime work hours to expedite construction
3. Construct new bridge adjoining existing bridge (use existing bridge for traffi c mainte-
nance)
4. Prescribe temporary stream crossing and approaches (e.g., stream crossing made of multiple
pipes/fi ll material)
5. Prescribe temporary bridge and approaches for bridges carrying high traffi c volume
6. Provide bridge on new alignment
7. Temporary measures to keep bridge open:
• Structure is in advance stage of deterioration; partial lane closure may be adopted by
posting lower load limits.
• Continue using on temporary basis if there is high traffic volume and/or there is no money

immediately available for full replacement.