In the US, 13,500 miles of highways regularly slow below the posted speed limits while 8,700 miles experience stop-and-go conditions. Traffic and road congestion is a frustrating reality for a large portion of those who commute by car. Unfortunately, traffic can’t always be predicted and is usually caused by saturation, construction, and accidents.
Saturation is the most common cause and occurs when there are more cars on the road than can be handled, usually due to a lack of infrastructure. However, the construction required to build new infrastructure can also be a main source of congestion. Accidents cause the most traffic as they are unpredictable and can span multiple lanes and directions.
Traffic impacts people, businesses, and supply chains. For commuters, traffic can add hours to weekly commuting times. Texas A&Ms Transportation Institute found that the average American spends 54 hours annually stuck in traffic. This number is set to increase to 62 hours by 2025. Costs associated with traffic in the US are also set to increase by 20 percent to $200 billion in the same timeframe.
For businesses, the movement of goods and services is greatly affected by traffic. The Department of Transportation found that traffic costs the trucking industry $27 billion a year because of lost time and extra fuel consumption. Some companies experienced a 5 percent to 10 percent reduction in drayage productivity (transportation of goods over a short distance).
While building alternative transit methods may have a positive effect on traffic, the cost to build up necessary infrastructure is extensive. To compare, building a brand new, 4-lane highway, costs between USD $4-$6 million per mile in urban or suburban areas, and USD $8 to $10 million per mile in urban areas. However, adding lanes to highways or roads is less expensive. For example, upgrading a 4-lane highway to a 6-lane would cost, on average, around USD $4 million per mile.
Looking at the cost to build public transit infrastructure, even upgrading current systems is much more expensive. A new light-rail connecting east and west Toronto was projected to cost CAD $3.66 billion in 2007. Now, the cost has increased to USD $4.45 billion, or nearly USD $314 million per mile, and is only 53 percent completed. Even the Blue line extension in Montreal was projected to cost CAD $670 million per kilometer, or approximately USD $857 million per mile, making it one of the most expensive subway projects in the world.
Overall, it’s clear that adding lanes and upgrading highways is much more cost-effective than building up public transit infrastructure.
Cities or neighborhoods that have exhausted other low-cost options for maximizing road capacity can add lanes to help improve traffic flow. New lanes in the right locations can draw congestion from other roads that can’t access such relief. Added lanes can also increase mobility throughout the area by providing access to areas that were once difficult to reach. New lanes may also encourage commuters to utilize the businesses in the surrounding areas, which stimulates the local economy.
In addition, new lanes that feed into greater networks can slow the rate of congestion. Data from over 100 urban areas show that when road capacity is increased at a similar rate as demand, such areas experience a slower increase in congestion. Though increasing lanes doesn’t fully eliminate congestion, it improves the flow of traffic through and around major roadways and could aid in stimulating the surrounding economy.
While traveling within a large metropolitan area, alternatives such as extensive bike paths and reliable transit systems encourage car-free lifestyles. However, in rural or suburban areas, these alternatives are not always an option. For most of the US, it can be difficult to get anywhere without a car, and for 45 percent of Americans, public transportation isn’t an option. Living without a car is only an option for those who live in certain areas, making well-maintained roads and cars necessary for a large percentage of the population.
In many cases, traveling by car can be faster, cheaper, and more convenient than alternatives such as planes, coach buses, or trains. Traveling from NYC to Philadelphia takes roughly 2.5 hours by car or by plane, but the cost to fly is approximately USD $66, compared to roughly $20 to drive. Trains are also expensive, at $45 for this trip, while a bus would cost $26
However, after a certain distance, driving isn’t always the best option. A trip from NYC to LA by car would take 43 hours, whereas a plane takes 8.5 hours. However, a bus would take 63 hours and a train would take 66 hours. In terms of cost, the plane is the cheapest at $151 and driving would cost $524. Though a longer journey, trains cost $184 and buses cost $211.
One of the greatest advantages of introducing transportation alternatives is the reduction in CO2 emissions. Almost 75 percent of greenhouse gas emissions related to transportation are seen through surface transportation such as cars, trains, or ships. Of these emissions, 45.1 percent come from passenger vehicles, such as cars and buses, and 29.4 percent come from road freight, including trucks. Though it is difficult to reduce road freight since trucks play such an important role in connecting the country, reducing the emissions from passenger vehicles is within reach.
To compare, a single-vehicle trip generates 0.96 pounds of CO2 per passenger per mile (ppm), whereas a bus with full occupancy only generates 0.18/pm. Additionally, heavy rail, light rail, and 4-person carpools generate only 0.11/pm, 0.14/pm, and 0.24/pm, respectively. Those who do live near stations or bus stops produced the least amount of emissions and drive 4,400 fewer miles per year than those who aren’t in such proximity.
By switching to alternatives, like a bus or subway, a typical two-adult, two-car household can reduce its annual CO2 emissions by 48,000 pounds. Overall, US public transit can reduce emissions by 37 million metric tons annually by providing commuters with an alternative option to driving.
Switching to transit alternatives can also save commuters thousands of dollars per year. Typically, one-way transit costs for buses or subways can range from $0.20-to $4.60, depending on the country and city. In New York, the cost is $2.80. Many cities offer weekly or monthly passes which give commuters unlimited uses, which, in NYC, costs $127 per month or $1,524 annually. Though it doesn’t seem significant, a pass gives you unlimited usage, so the savings are greater if you factor in other trips. Commuters can also choose to bike, which has an average annual cost of $308, or walk, which is free.
The cost of a vehicle alone is significant, with car payments, gas, insurance, maintenance, and more. Annually, the average car owner spends $9,122 per year to own and operate their car.
Living in a big city, like San Francisco, the annual savings from not owning a car amount to $14,625. However, cities need to be equipped with proper public transit infrastructure to support residents without cars.
The greatest argument in favor of alternatives is the reduction in congestion, which is a direct result of decreasing the use of cars. This was realized in LA in 2003 when transit workers went on strike. They found that during the 35-day shutdown of all major bus and rail lines, congestion increased from 53 percent to 90 percent on roads. On US 101, which parallels the major rail line, traffic increased by 123 percent. After the strike, congestion decreased by 47 percent. Though traffic was still an issue after this period and continues to be problematic for commuters, this shutdown displayed the true reliance on public transit. Now more alternatives need to be added and upgraded to further decrease congestion on major roadways to realize the full effect.
Take the success in Copenhagen, Denmark, where 90 percent of residents own bikes compared to only 40 percent who own cars. They have made it more accessible to travel by bike by introducing more paths and lanes and increasing bike parking at transit stations. Currently, only 26 percent of trips are done by car, whereas 27 percent are completed using public transit and 41 percent are done by bike. They have become a top performer in reducing congestion by introducing more accessible alternatives to commuters.
Greater capacity on roadways can be an effective way to aid in traffic control, however, it does not always reduce congestion. Induced demand is a phenomenon that demonstrates that adding more lanes incentivizes people to drive more frequently, increasing the overall number of drivers and the total distance driven. Somewhat counterintuitively, reducing the number of lanes and adding alternatives can reduce traffic by encouraging people not to drive their vehicles.
As a result, the only long-term way to reduce congestion is through investment in alternatives, such as public transportation, biking, and walking routes. Though this solution isn’t always possible in areas with a lack of infrastructure, larger cities could reap the benefits of turning to alternatives. Not only are alternatives considerably better for the environment, but they also reduce dependency on cars and ultimately save commuters money.