For an underground urban freeway is in an enclosed space,pollution from vehicle emissions can be collectively filtered and disposed with high-technical method.

Study on the post-evaluation of urban expressway landscape system;

On-ramp metering control strategy of urban expressway;

Coordinated control of urban expressway ramp flow based on model prediction;

The Research of Urban Expressway Free-flow Velocity;

A Number of Studies of Expressway Control;

The greening belt drainage design of urban expressways is adopting plastic blind drain,which can remove the infiltration rainwater effectively,keep the road foundation dry and away from the damage of water accumulated.

At present, so much research has been done much on merge and diverge areas of interurban expressways.

Now what we should do is to takeefficiency measure to increase the capacity of the urban expressways.

At present,researches on traffic flow theory are mainly focus on highway traffic,which is significantly different from urban freeway.

The traffic operation characters and main problems of Shanghai urban freeway were analyzed.

Results of analysis show that: (i) although ramp-metering control can increase the delay on ramp, it can also increase the efficiency of the whole traffic system including urban freeway and ramp; (ii) ramp-metering control has positive and negativ.

Authors analyzed the location problems involving distance decay,share rate,and depot efficiency on the passageways of urban underground expressway.