By June Valliere Concern about exacerbating an already heavily trafficked area was the focus of the Planning Board’s review of the Carroll School’s expansion plans on October 15. The school plans to expand enrollment from 50 to 250 students within the next 10 years. To do this, the school proposes to replace two of its smaller buildings with a two-story academic building. The total footprint of 47,506 square feet would sit on 11.4 acres. Due to the expected traffic increase, a school zone with a 20 mph speed limit is proposed for a stretch of the road near the campus.