Why Do Semi's Have 18 Wheels?

[sonicbuffalo_RIP]

https://www.yahoo.com/autos/question-of-the-day-why-do-semi-trucks-have-18-162709366.html

 

[cwgrizz]

And now with the "Super Singles" they are "10 Wheelers"

 

[Roy1961]

technically they have 19, steering wheel, ok i am outta here:cheerful:

 

[aroy]

In India the limits are on the load of each Axle not on the gross weight. Gross weight comes in only for long bridges. So theoretically we can have more than 4 axles of 4 wheels each, but normal shipping containers require only 4 axles hence their prevalence. Extra size loads do have many more axles, once I saw one with around 20 axles of 8 wheels each - 166 wheels! carrying huge transformer from port to the hills a journey of more than 2500 km.