(Portland, OR)  --  A man who's accused of hitting a woman who was flagging traffic in a Southeast Portland construction zone is free after pleading not guilty.  Authorities believe 48-year-old Patrick Miller was huffing laughing gas before he hit Margot Davis as she stood on a sidewalk near the intersection of Southeast Division and 68th Avenue Wednesday.  Davis is listed in critical condition.  Miller was released from custody yesterday because he doesn't have a significant criminal record.