...C WRIGHT; ROBERG ORENSTEIN; P; P R ORENSTEIN © Thomas Telford and ICE 1999 MIDDLESEX UNIVERSITY BELLCORE TRAFFIC JAMS CONGESTION CONTROL MODELS SIMPLE PROPAGATION MANAGEMENT MODELLING NETWORKS GRIDS IDEALISED IDEALISATION FORMATION GRIDLOCK DISPERSION GATING...

... failure, soft or vari- layers and into the overlying ballast. Drainage able formation stiffness and excessively stiff provision was also inadequate. The questionof formation. using crushed stone dust insteaodf sand in the Ballast contamination may result from fines treatment of subgrade erosion...

... at Stansted; reference is also made to work at Heathrow involving Gravel/Brickearth deposits and at Glasgow where soft clay deposits occur. The dual use of both lime and cement to modify and strengthen the natural subgrades and earthwork formation are described together with summaries of the main control...