Chapter F8 Renewal of roads

F8.8 W/C 241: Preventive maintenance

Definition: work category 241

Preventive maintenance

This work category provides for non-routine work required to protect the serviceability of the following from damage, and to minimise the threat of road closure arising from natural phenomena:

• roads
• road structures
• eligible cycle facilities.

The work provided in this work category is not eligible for programming in the maintenance, renewal or emergency reinstatement work categories.

Examples of qualifying activities

Examples of qualifying activities include:

• new works that protect existing roads from sea or river damage
• new drainage to drain incipient slips
• toe weighting of unstable slopes
• protection planting designed to arrest the slumping or displacement of a road platform
• work to overcome changes in a river's course or bed level that threaten roads, bridges or other road-related structures, but which is not attributable to one climatic event.

Exclusion: work category 241

This work category excludes maintenance of protection planting. This is covered under work category 121: environmental maintenance.

Protection planting: work category 241

The following components of protection planting are eligible for funding assistance under work category 241:

• the initial costs of planting, including any fencing or other protective measures to prevent damage by stock
• the purchase of any land required outside the road reserve for planting and/or retirement
• compensation payable to a landowner for a covenant to retire land and/or plant trees for road protection where purchase is impracticable or undesirable.

Approval of funding assistance for protection planting is conditional on the following:

• legally enforceable agreements are to be implemented that define the responsibilities for management of retired areas outside the road reserve

no duplication of funding assistance from the NZTA and other sources.

Evaluation: work category 241

These works must be individually identified and economically justified. They must be the long-term, least cost option for the RCA, calculated in terms of present value (PV).

A risk assessment procedure must be followed, and sites that are identified with greater than high risk are eligible for immediate funding consideration. Lower level risk with less likelihood items may be programmed for future years.

The cost of proposed reinstatement must be assessed against the NZTA's policy on uneconomic roading facilities.

References:

• For detail on uneconomic roading facilities, see section F10.13.
• A simplified economic efficiency procedure is provided for preventative maintenance in the Economic evaluation manual, volume 1 – see SP1.

Do-minimum work counted for NPV calculations must be feasible and reasonable as acceptable to the NZTA – refer to the EEM1 section 2.8

Risk assessment procedure

Click to see table.