The table and chart give information about the percentage of travellers, the average age, as well as the amount of CO₂ produced by each person per mile from different means of transport which people use to reach their work in Houston, Texas.
People driving alone account for almost half of the total travellers. This is the most common means of transport with 48 percent. The second highest number of travellers is the group of people who use public transport, account for 27 percent. The cyclists and pedestrians have the of least travellers, just 4 percent. By comparison, the percentage of people sharing a car travel represents 11 percent.
The average age of people travelling by train or bus tend to be higher than other mentioned means of transport, on average 47.8 age. Walkers and cyclist has the lowest average age—just 39 age. The percentage of people driving alone or travelling together is in the middle. These two groups have the average age approximately the same, with 43 and 44 years old, respectively.
Travelling by public transport or cycle are environmentally friendly means of transport. because these cause little or no CO₂ emissions. While using the car generally produces a lot of CO₂, especially cars with just driver cause the most pollution. Per person drives alone produces more than 0.3 kilograms CO₂ per kilometre.
Overall, car drivers without passenger is the largest number group of travellers to work and cause more ppllution than all the other means of transport combined.