The roundabouts, at the exit and entrance ramps from Riverside to the interstate, opened this weekend after about seven months of work. Riverside previously had one lane in both directions with no turn lanes, and with traffic signals at the ramps. Back-ups caused by vehicles queued up to turn left were frequent.
With the new configuration, two lanes feed into the roundabout. One lane is used to enter the traffic circle, and the other is a right-turn lane. There are no left turns across oncoming traffic.