From the City Council :

The effect of the Order is to prohibit temporarily (1) all southbound vehicular traffic in Riverside Approach from its junction with Magdalen Yard Road to its junction with Riverside Drive and (2) all right turning traffic (westbound) from Barnetts Garage onto Riverside Drive.
Pedestrian access and vehicular access to premises will be maintained where possible.
Alternative routes will be available via (1) Magdalen Yard Road, Windsor Street, Perth Road and Riverside Drive and (2) Riverside Drive (eastbound), Tesco Roundabout and Riverside Drive (westbound).
Please forward any comments you may have regarding this proposal to the Network Management Team, City Development Department, Dundee House, 50 North Lindsay Street, Dundee, DD1 1LS - contact phone number - 433168.