NCHRP Web-Only Document 431: Snapshots of Planning Practices, provides a series of illustrated "snapshots" as as a resource for transportation-planning practice development. This supplemental web-only document provides information for realistic practice implementation and program advancement and was published accompanying NCHRP Research Report 1158: Developing Snapshots for Transportation Planning.

NCHRP Research Report 1158: Developing Snapshots for Transportation Planning, chronicles the process of developing four Snapshots of Planning Practices. Snapshots are concise and visually appealing documents that report on current planning practices in use by transportation agencies across four practice areas: Complete Streets, Data Sharing for Performance Management, Collaboration on Local Freight Delivery, and Economic Analysis to Support Decision-Making.

This synthesis documents how state DOTs manage Mechanically Stabilized Earth (MSE) walls in their inventories, including practices for maintenance, rehabilitation, assessment, and life-cycle cost analysis. While MSE walls are common in transportation projects for their efficiency and resilience, most are too new to evaluate long-term performance, and design standards have evolved significantly over time.