Motorcyles,Cars, trucks, trains, airplanes, and the first tanks.
Tanks
I believe it is tanks.
Jeeps and 2 1/2 ton trucks were most common.
HumVee was not created until the 1970s and developed into what it is today. They barely had vehicles in World War 1. Most of the people had horses and carts and they hauled military supplies with carts.
Two military vehicles first introduce in World War I were the armored tank and self-propelled artillery. Both greatly increased the number of people killed during the war and provided significant advantages to the countries who used them.
Tanks and submarines were the two military vehicles that (to the best of my knowledge) were introduced during World War 1.
tanks & airplanes
Tanks And Zeppelins
300,020 airplanes where used in World War 1
Im not telling you
Yes it was used in World War 1 but it was stopped being used in World War 2
Yes, world war 1 had tanks. World War 1 was the introduction of battle-ready tanks used in war.