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pace. The majority of roads are publicly owned and free of access. Increased traffic has adverse impacts on public activities which once crowded the streets. These include, but are not limited to agoras, markets, parades and processions, including protests and marches, games, and various other examples of community interaction. These have gradually disappeared to be replaced by automobiles in countries like the United States. In many cases, these activities have shifted their focuses to shopping malls while in other cases, they have been completely abandoned altogether. Traffic flows influence the life and interactions of residents and their usage of street space. More traffic impedes social interactions and street activities. People tend to walk and cycle less when the automobile traffic is particularly high.
 
In addition to problems that directly affect human beings, urban transport with it's often over use and/or misuse plays an adverse affect on the planet. The pollution that is created by circulation also adversely affects the health of the urban population. Also, energy consumption by urban transportation has dramatically increased, strengthening the dependency on petroleum.
 
Another common problem in urban transport planning is the prevalence of traffic accidents. Growing traffic in urban areas is linked directly with a growing number of traffic accidents, and the injuries and deaths that accompany it. Accidents also cause delays, feeding the other urban transport problems. As the automobile traffic in urban areas increase, the urban population looses a sense of safety.
 
One of the other most common problems is the excessive use of land. The territorial imprint of transportation is significant, particularly for the automobile. Between 30 percent and 60 percent of a metropolitan area may be devoted to transportation, an outcome of the over-reliance on some forms of transportation.
 
Finally, globalization and the materialization of the economy have resulted in the growing quantities of freight moving within urban cities. As freight traffic commonly shares infrastructures with the circulation of passengers, the mobility of freight in urban areas has become increasingly problematic.
 
The main issue that branches off into all the others is the over-dependency of the automobile. For consumers and producers, the automobile has advantages such as on demand mobility, comfort, status, speed, and perhaps most importantly, convenience. When given the choice and the opportunity, most individuals will prefer using a personal automobile over other forms of transportation. Several factors influence the growth of the total vehicle fleet, such as sustained economic growth, meaning the increase in incomes and quality of life, complex individual urban movement patterns, meaning many households have more than one automobile, along with more leisure time and suburbanization. Therefore, rising automobile mobility can be perceived as a positive consequence of economic development to some, and thus go along with the trend. It's important, and cannot be emphasized enough that the acute growth in the total number of vehicles gives rise to congestion at peak traffic hours on major thoroughfares, in business districts and often throughout the metropolitan urban area.

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