Providing more evidence of a strengthening economy, Associated Builders and Contractors’ (ABC) Construction Backlog Indicator (CBI) set a record as it expanded to 9.45 months during the third quarter of 2017, up 9.8 percent from the second quarter to the longest backlog reading in theÌýeight-year history of the series.Ìý CBI is up by 0.8 months, or 9.2 percent, on a year-over-year basis.