Dreamland Travel Tubes

The future kind of transportation has recently been developed in our mobility technology labs and it's amazing. The basic idea is to have a system of tubes with a certain size, much like our streets, but below earth. They are designed in a hub like system where the bigger cities distributor nodes are connected through various tubes, which in turn are connected with smaller distributor nodes and finally to the end user or public terminal. Instead of a car, you'll own a cylindrical carrier device. You get into it, enter the destination and it will take you wherever you want and wherever you have access to. At first the system will be mostly public, but as the technology becomes cheaper it will connect to each and every household. The advantages of this system compared to the automotive transportation of the early 21st century are:
1. Higher throughput - the whole system will be computer operated and highly efficient, gone are the times of waiting infront of a street-light with no car coming from either direction and gone are the days of human error. Computers are not perfect either, but there will be a lot less accidents.
2. Greater speeds - the technology to move these devices will be similar to the technology of maglev trains which could already reach speeds of 500kph in the early 21st century.
3. Mixture of public and individual transportation - it's still individual transportation as you can get to any point from any point, however it can also be used publically if the state provides several carrier devices for public use, anybody could call them and use them to go wherever they please (or wherever they are allowed to go with them).
4. As green as the sources you generate electricity from and in general there will be a lot less contamination than with cars
5. Different tubes for different services - a passenger tube has different requirements than one for goods.

Basically it's like a gigantic pneumatic post system.