Public transport has much lower emissions than private transport modes such as cars. Individuals prefer to use private transport modes due to their ability to move faster in traffic. Public transport modes can overcome this disadvantage in urban traffic by given them preference in traffic. Signalised intersections are the best locations where you can give priority for public transportation e.g., trams, buses, etc. 

A 'bus-jump' signals  allows buses to take off before other modes and there remain ahead of the traffic.

Congestion charging was introduced into central London in February 2003. In February 2007 the original central London congestion charging zone was extended westwards, creating a single enlarged congestion charging zone.  Congestion charging contributes directly -
• to reduce congestion;
• to make radical improvements to bus services;
• to improve journey time reliability for car users;
• to make the distribution of goods and services more efficient;
• to reduce emissions.

Mitsubishi Electric Corporation has developed a new technology that reduces total railway energy consumption by up to five percent. The technology enables full use of regenerative power in trains through real-time control of voltages at nearby substations. The five-percent reduction of total railway energy consumption was achieved in numerical simulations using a high-density urban railway model.