Control of traffic is a difficulty for urban planners. Serious care must be given to the provision of affordable, high-quality transport, especially during peak hours. The world's responses to this issue have been diverse. Western European cities, which are more densely populated than North American cities, have emphasized the promotion and provision of alternatives to private transportation.like mass rail transit (MRT), light rail transit (LRT), and rail-based transit, such as public transportation buses, bus rapid transit (BRT), and underground tubes. Towns are now more bicycle- and pedestrian-friendly thanks to them.

The Americans, in reverse, created a system of roads and other infrastructure that promoted and aided the use of automobiles. In the decades between 1950 and 1960, the US constructed a significant number of flyovers in inner cities. These multi-laned highways, known as "motorways" in the US, entered into the cities as well, avoiding the main commercial and residential thoroughfares. These motorways were thought to have advantages in decreasing emissions, preventing traffic congestion, and speeding up travel.

Roadway side effects

The recognition that the motorways did not address the aforementioned issues came about in the 1970s. In some ways, they may have made matters worse. These motorways attracted more cars, which led to more people purchasing cars and using the motorways as a result of the extra space they created. This had the effect of creating a zero-sum game, or "induced traffic". In addition, urban highways around the world have caused negative effects on cities like worsening air pollution, displacing communities, increasing congestion, severing neighborhoods, losing architectural heritage, increasing crime, and dead spaces, and halting economic development, according to the Institute of Transportation and Development Policy.

Strangely, it was widely believed that several urban motorways, particularly those in the US, were designed to avoid passing through black districts and other racial collectives. According to rumors, the motorways were built to give the 'white' community in the suburbs a comfortable route to the city center by avoiding the low-income racist community areas in between. This situation may be all too familiar to Karachi residents.

thereby, the construction of urban roads and highways is an emotive topic everywhere. More than 20 such roads have been eliminated all across the world since 1987. The Embarcadero Motorway in San Francisco, the Barbican in Paris, and the rebirth of the Cheonggyecheon River in Seoul are a few of the most famous examples of freeway-based corridor transformations. Naturally, most of these changes took place in the USA, where the majority of these urban motorways were located.

Road Planning issues for developing nations

But developing nations appear to be stuck with that issue. Although mass transit systems offer efficient and cost-effective transportation options, they require a sizable initial capital investment as well as ongoing financial support to operate. Developing nations frequently struggle when attempting to balance the benefits and costs of various transportation planning considerations. Therefore, cities in developing nations that are unable to offer their citizens an adequate public transportation system attempt to shift that demand to private modes of mobility like cars and motorbikes.

The circumstances of Pakistan in general and Karachi's status especially are extremely the same. By creating signal-free corridors and adding more lanes, the problem of peak-hour traffic is overcome. These no-traffic lanes are established by blocking off crossings and installing bridges and underpasses.