what does "on down the road "mean?
Machael Jackson sing a song named "ease on down the road ",then what does it mean? i mainly want to know some points in grammar. is "on" a prep ? or adv? and why is there another prep"down",how to know it?
"trouble is a friend "by lenka,is not bad ,and there is a sentence "So don't forget as you ease on down the road"
and do they have the same meaning ?

Question

what does "on down the road "mean?
Machael Jackson sing a song named "ease on down the road ",then                           what does it mean?  i mainly want to know  some points in grammar.   is "on" a  prep ? or adv? and why is there another prep"down",how to know it?
"trouble is a friend "by lenka,is not bad ,and there is a sentence "So don't forget as you ease on down the road" 
and do they have the same meaning ?

Answer

You misunderstood. "ON" belongs to the verb 'to ease' here, meaning: "To move or proceed with little effort." ON just denotes ongoing action in this case, like in 'to go on.' 

So, not using 'ease on' in: 

"So don't forget as you ease on down the road." 

Would make something like: 

"So don't forget as you gently go (keep on going) down the road."

Answer

Hi Bruce,  in both songs they mean the same thing, it means to drive slowly down a road, don't rush.

Verpassen Sie nicht die Gelegenheit, bequem von zu Hause aus eine Sprache zu lernen. Stöbern Sie in unserer Auswahl an erfahrenen Sprachlehrern und melden Sie sich jetzt zu Ihrer ersten Unterrichtsstunde an!