By MICHAEL A. LINDENBERGER and THEODORE KIM Dallas' road projects have failed to keep up with growth, officials say, causing rush-hour duration to more than double, from 2.9 hours in 1982 to 7.6 in 2005. MELANIE BURFORD/DMN Dallas' road projects have failed to keep up with growth, officials say, causing rush-hour duration to more than double, from 2.9 hours in 1982 to 7.6 in 2005. Rush hour keeps getting longer for drivers in Dallas, where a new study says traffic delays are among the worst in the nation. And it's not likely to get any better soon. Drivers here lose...