Do any of you have suggestions as to the best way to separate or define gravel drive from lawn areas? We're talking thousands of feet here so railroad ties, etc are out. I've changed some lawn area shapes to make them easier to mow by killing with Roundup and am ready to add gravel. I've always used 5/8"minus as a top dressing, but saw a place with 3/4"chips that I liked. What do you think of using it--I like the crunching sound the chips make, but they don't pack like the 5/8. Thanks for any suggestions. Will M.