As Predicted


There is a transportation challenge facing the United States which must be addressed in order for the country to continue to grow and prosper, as summarized in the chart below.

The road system cannot keep up with the projected growth in population and shipment weight. With roads already congested, any further increase is not sustainable. While there are many potential solutions to this challenge, an obvious one would include short sea shipping.  Re- introducing short sea shipping will add capacity and redundancy to an already strained system.

In addition to the reemergence of short sea shipping in the United States, the type of cargo movement is also important.  Further breaking out the shipment weights above yields the fact that the import/export markets (orange in the chart below) pale in comparison to the domestic market.

Instead of competing over the relatively small amount of import/export  cargo in the UnitedStates, the focus should be on domestic moves.


All of the following facts and figures have been taken from the United States Department of Transportation (Federal Highway Administration and Bureau of Transportation Statistics ) “Freight Facts and Figures 2013” publication, except where noted.

United States Population








1990 – 2012

Est. 2040

(million) 1


1990 – 2040

Total U.S. 248.8 313.9 26.2% 380.2 52.8%
Northeast 50.8 55.8 9.7% N/A N/A
South 85.5 117.3 37.2% N/A N/A
  • The population of the United States is expected to grow more than 50% by 2040 (as compared to 1990)
  • The South has been growing at a faster rate than the Northeast

United States GDP








1990 – 2012

Est. 2040

(billion) 2


1990 – 2040

Total U.S. $7,883 $13,431 70.4% $27,462 248.4%
Northeast $1,808 $2,709 49.9% N/A N/A
South $2,503 $4,729 88.9% N/A N/A
  • The GDP of the United States is expected to grow by nearly 250% by 2040 (as compared to 1990)
  • As with population, the South has been growing at a faster rate than the Northeast

Weight of Shipments




(mils of Tons)


(mils of Tons)


2007 – 2012


(mils of Tons)


2007 – 2040

Domestic 12,587 12,973 3.1% 18,083 43.7%
Export 95 118 24.2% 368 287.4%
Imports 97 92 (5.2)% 335 245.4%
Domestic 1,745 1,855 6.3% 2,182 25.0%
Export 61 82 34.4% 388 536.1%
Imports 93 82 (11.8)% 201 116.1%
  • Imports decreased from 2007 to 2012, but that trend is not projected to continue
  • The 2012 domestic market is much larger than imports and exports combined, by a factor of more than 60x for truck and 11x for rail


In 2002 the U.S. transportation system moved an average of 43.0 million tons per day (across all modes)

  • In 2012 the US Transportation System moved an average of 54.0 million tons per day (across all modes), a 25.6% increase over 2002
  • Against these freight increases, the National Highway System (NHS) has only grown from 161,189 miles in 2000 to 163,741 miles in 2011, a 1.6% increase
  • Despite the increase, congestion has remained relatively the same (See Appendix II)
  • The NHS represents approximately 4% of the total public road miles but carries over 44% of the travel
  • Notably, Class 1, Regional and Local Railroads have shrunk from 170,512 miles in 2000 to 138,518 miles in 2011, and (18.8)% decrease
  • Despite doubling over the past twenty years, commercial trucks only accounted for 9% of highway vehicle-miles travelled in 2011
  • On segments of the NHS with high volumes and large percentages of trucks, at least one of every four vehicles are trucks; the number of these heavily-travelled routes are expected to grow 175% from 2011 to 2040
  • By December 2017, Electronic Logging Devices (ELD) will be mandatory and will track a driver’s day to a maximum of 11 hours behind the wheel, whether moving or not
  • Every four years, the American Society of Civil Engineers grades American infrastructure
  • Since 2001, the overall grade has been a D+ or a D
  • Roads have ranged from D+ to D- since 2001
  • In 2017, the estimated cost to improve our aging and failing infrastructure is
  • $4.57 trillion

The 3.5 million6 Commercial Licensed Drivers employed today are estimated to grow to 5 million in 2040, assuming all factors are constant (load weights, distances, etc.), despite the reality of today’s driver shortage. Truck transits are the backbone of the American transit system representing 84% of all the transits in the U.S. of less than 750 miles, despite being less than 10% of the highway vehicle miles travelled.

Tufts University and the Institute for Global Maritime Studies projected the severity of truck traffic in 2020 in the map7 on the following page. All the projections from the government indicated that things will only continue to deteriorate by 2040.

The Department of Transportation commissioned Reeve & Associates to perform a study8 analyzing the effect that door-to-door shipping has on the transportation infrastructure around the country.  This study estimates that the annual potential U.S. Short Sea Market can draw from the more than 78,200,000 trailer loads (48’ or 53’) moved between U.S. destinations more than 500 miles apart and within 250 miles of a port, along the U.S. coasts.

Four corridors and their average annual truckloads are:

  • Gulf to New York/New Jersey: 10,000,000 truckloads
  • South Atlantic to New York/New Jersey: 6,000,000 truckloads
  • Florida to New York/New Jersey: 3,500,000 truckloads
  • Gulf to Florida: 5,700,000 truckloads

These four high volume corridors total approximately 25,000,000 48’/53’ truckloads each year equaling a container volume of more than 63,000,000 TEUs annually.  Appendix I contains maps generated from Tufts University and the Institute for Global Maritime Studies 7 for several of the corridors above.


The National Highway System has essentially remained the same since its designation in 1995, in terms of number of miles. Railroad miles have actually decreased.  There are a few stark realities about the future if the country is going to be able keep up with the projected 2040 50+% population increase and 40+% increase in truck cargos against an essentially flat road system and declining rail system.

Either the NHS will have to build 65,500 miles of new interstates (along with finding the money and land to pay for it), as well as an additional 1.5 million drivers and rail will have to expand 34,600 miles (with likely similarly congested corridors) OR something else needs to happen in order to handle expected capacity.

The Federal Highway Administration wrote in 2012;  Assuming no change in network capacity, increases in truck and passenger vehicle traffic are forecast to expand areas of recurring peak- period congestion to 34% of the NHS in 2040 compared to 10% in 2011. This will slow traffic on 28,000 miles of the NHS and create stop and go congestion on an additional 46,000 miles ”.

Based on the above facts, the “Inconvenient (Transportation) Truth” is that our national transportation network is at full capacity right now. We can’t put any more cargo thru the existing system. There does not appear to be a plan for the projected future growth in population and GDP. Further, we simply do not have the money to repair the existing system let alone pave our way to future prosperity.

Our thesis is that the American Marine Highway is a significant enabler and needs to be part of the future solution.  The AMH’s natural unlimited abundance of transit capacity costs nothing to create and little to maintain. We have to refocus and relearn how to use the AMH.

The largest domestic market in the world needs new transportation capacity. This is not about capturing more import/export  market share; it is about domestic cargo movement.

We have the answer. It long past time to return to the sea.



Does building more roads create more traffic?

By M. Beck (Sr. Lecturer, Infrastructure  Management, Univ. of Sydney) and M. Bliemer

(Professor, Transport and Logistics Network Modelling, Univ. of Sydney) 4/15/15

Congestion is a major source of frustration for road users and has worsened over time in most cities. Different solutions have been proposed, such as introducing congestion charging (a favourite of transport economists) or investing in public transport. The solution put forward most often is to build more roads. But does this approach actually work?

A recent study in the United States identified Los Angeles, Honolulu and San Francisco as the top three most gridlocked cities in the United States. All of these cities use almost exclusively road-based solutions to transport citizens. Meanwhile, China has increased its expressway network from 16,300 km in the year 2000 to around 70,000 km in 2010. Yet the average commute time in Beijing increased by 25 minutes between 2012 and 2013 to 1 hour and 55 minutes.

So why do residents of these cities not live in a driving utopia, despite their huge amounts of road capacity?

Induced demand

The first thing to get your head around is a concept called induced demand.

Think about the street where you live. If a new road makes driving to work quicker, you may benefit from that.

But this reduced travel time might be enough to encourage two other people in your street to start driving; and two more people in the next street; and two more people in the street after that; and so on. Very quickly, the drive to work takes just as long as it ever did.

In transportation, this well-established response is known in various contexts as the Downs- Thomson Paradox, The Pigou-Knight-Downs Paradox or the Lewis-Mogridge Position: a new road may provide motorists with some level of respite from congestion in the short term, but almost all of the benefit from the road will be lost due to increased demand in the longer term.

To add insult to injury, while more roads may solve congestion locally, more traffic on the road network may result in more congestion elsewhere. In Sydney, for example, the WestConnex may improve traffic conditions on Parramatta Road, but may worsen congestion in the city as a whole.

Weakest links

Congestion is determined by the weakest links in the road network. If road capacity expansion does not involve widening of these bottleneck links, congestion may simply move to another part of the network without solving the congestion problem. Moreover, it could potentially make congestion across the network even worse.

The Braess Paradox is a famous example in which building new roads in the wrong location can lead to longer travel times for everyone, even without induced demand, because new roads may lead more car drivers to the weakest links in the network. The reverse may also be true: removing roads may even improve traffic conditions.

This paradox occurs because each driver chooses the route that is quickest without considering the implications his or her choice has on other drivers. Car drivers only care about the number of vehicles in the queue in front of them and do not care about vehicles queueing behind them. This is a classic problem in game theory, very similar to the type f or which John Nash was awarded a Nobel Prize.

What does the data say?

One US study has shown a strong relationship between the amount of new road length and the total number of kilometres travelled in US cities, a finding the authors of that study termed “the fundamental law of road congestion”.

Similar findings are reported in Spain and in the United States, where even major road capacity increases can actually lead to little or no reduction, in network traffic densities. It has also been found to exist in Europe, where neglecting induced demand has led to biases in appraising of environmental impacts as well as the economic viability of proposed road projects.

In Sydney, there is similar evidence from traffic volumes crossing the harbour. The Sydney Harbour Bridge was carrying a stable traffic volume of around 180,000 vehicles per day from 1986 to 1991. The Sydney Harbour Tunnel opened in 1992, and the total volume of traffic crossing the harbour increased in 1995 to almost 250,000 vehicles per day. This 38 per cent increase in traffic can be attributed to induced demand and not to population growth (which was around 4 per cent during this period)

Empirical observations have also confirmed the existence of the Braess Paradox. For example, in 1969 a new road was built in Stuttgart, Germany, which did not improve the traffic conditions. After closing the road again, congestion decreased.

Similar observations in which road closure led to improved traffic conditions have been observed in New York City. where upon closing 42nd street (a major crosstown street in Manhattan) it was observed that traffic was significantly less congested than average.

A recent experimental study confirmed that this paradox still exists by showing that expanding road capacity can result in worse traffic conditions for everybody.

The theory of induced demand is accepted by a large majority, but not by everyone – the authors of a 2001 paper argued that induced demand does not exist. However, UK researchers Goodwin and Noland have criticised this study.

In isolation, building more roads can certainly improve traffic conditions, but these effects may only be local and short run. Roads alone do not solve congestion in the long term; they are only one (problematic) tool in a transport management toolkit.


1 Colby, Sandra L. and Jennifer M. Ortman, Projections of the Size and Composition of the U.S. Population: 2014 to 2060, Current Population Reports, P25-1143, U.S.Census Bureau, Washington, DC, 2014.

2 Organization for Economic Cooperation and Development GDP Long Term Forecast orecast.htm

3 United States Department of Transportation Bureau of Transportation Statistics 2002 / /publications/freight_s hipments_in_am erica/html/entire.html

4 Our Nation’s Highways Selected Facts and Figures 1998: Department of Transportation

Federal Highway Administration

5 ASCE’s 2017 American Infrastructure Report Card:  https://www.infrastructurereportcard. org/

6 American Trucking Association: ormation_Re ports.aspx

7 America’s Deep Blue Highway: How Coastal Shipping Could Reduce Traffic Congestion, Lower Pollution and Bolster National Security, Institute for Global Maritime Studies in cooperation with the Fletcher School of Law and Diplomacy, Tufts University, September 2008

8 MARAD: Four Corridor Case Studies of Short Sea Shipping Services (2006)