11.1 Introduction
This section provides design guidance for 2R projects meeting all the following conditions:
- Project is on a non-freeway facility;
- Not on the National Highway System (NHS); and
- Current ADT ≤ 2,500 per lane.
These guidelines should be used in determining design scope and estimating cost for individual candidate projects whenever a restoration program is being developed. Preliminary structural planning should be coordinated with BRG.
This chapter discusses the features and design criteria for 2R projects and includes the following sections and subsections:
11.1 Introduction;
- 11.1.1 Definition
- 11.1.2 Upgrading; and
11.2 Crash Analysis
11.1.1 Definition
2R projects are defined as work performed to restore pavement structure, ride quality, or other necessary components, to their existing cross section configuration. The principal purposes of these projects are surfacing and repair of the pavement structure. The addition of through travel lanes is not permitted under a 2R project. The addition of continuous two-way left-turn lanes (TWLTL) acceleration/deceleration lanes, turning lanes, and shoulders are acceptable as restoration work as long as the existing through lane and shoulder widths are maintained as a minimum.
Additional TWLTLs, acceleration/deceleration lanes, and turning lanes should meet the minimum widths of 3R criteria as described in
. The 2R work may include upgrading roadway components as needed to maintain the roadway in an acceptable condition.
If bicycle accommodations are provided, they must meet the requirements specified in
.
11.1.2 Upgrading
Where the work is cost effective and funds are sufficient to upgrade to reconstruction or rehabilitation design criteria without jeopardizing District priorities for other restoration work, development of projects to higher criteria may be done at the District’s discretion.