SARAH LONGWELL Guest Columnist WASHINGTON Two weeks ago the House Transportation Committee unveiled the details of its six-year, $450 billion overhaul known as the Highway Bill. Buried in the blueprints, not surprisingly, are some generous handouts for special interests. One such favor is a provision that would require a controversial sentencing requirement for low-level, first-time DUI offenders: ignition interlocks. These in-car breathalyzers prevent a vehicle from starting if its driver’s breath registers above a pre-set blood-alcohol concentration (BAC) limit. Because they are so expensive, intrusive, and prone to technical failures, this penalty has typically been reserved for the most extreme DUI offenders.