Just noticed it this morning, mainly because there wasn't the usual queue of traffic there. I suspect it'll end up getting ignored though as it's forcing all the traffic into one lane. If it's enforced it'll be an excellent idea as the timing on the lights means that any traffic waiting under the arc won't get out first time so it makes no difference if there's 2 lanes or one lane queuing there. Maybe a motorbike lane (if space allowed) put on the right would put an end to all nobs on scooters trying to use the cycle lane and blocking up the ASL.