question: Of the 3.5 miles from N. Mountain Avenue to Rillito River Park , how many are bike-only ?
answer: half
turker_answer: Of the 3.5 miles from N. Mountain Avenue to Rillito River Park , half are bike-only .
rule-based: Of the 3.5 miles from N. Mountain Avenue to Rillito River Park , bike-only are half .