"danger for motorists" and "danger to motorists" are both correct but can indicate two slightly different things.
A danger to motorists would indicate a danger from an outside source such as an object in the road, bad weather or fog, damage to the road, another driver, etc.
A danger for motorists can mean the same but more often it would indicate a danger from the driver him or herself, such as over tiredness, alcohol or drug use, something wrong with their vehicle, etc.
If you use them interchangeably no one will mind, it's not that much of a difference.
The correct spelling is "motorists" (driver of an automobile).
No, "will be had" is not a correct grammar. The correct grammar would be "will have."
No, it is correct grammar, not a correct grammar.
The correct grammar is: "Are those correct?"
"On a train" is correct grammar.
The correct grammar for this sentence is: "When did you send it?"
no_____If the sentence is You do do that (meaning You are in the habit of doing that) the grammar is perfectly correct and the sentence 'does have correct grammar'.
No, the correct grammar would be "I hate you the way you hate me."
"July has just been started" is not correct grammar, instead the correct grammar is "July has just started."
its has he kissed you yet that's the correct grammar-Erendiraa
The correct way to phrase this question is: "Is my mother and I correct grammar?"
The grammar is correct as it is.