The phrase "additional visitors" is correct and usable in written English.
It can be used when referring to extra or more visitors beyond a certain number or expectation.
Example: "The event was a success, attracting additional visitors who were not initially expected."
Alternatives: "extra guests" or "more attendees".
But with the addition of a Web site (www.chinaranch.com) the Browns have attracted up to 300 additional visitors a year from Las Vegas and southern California and as far away as the East Coast and Canada.
It seems evident by now that free admission attracts additional visitors.
(And most still have space for additional visitors on this year's tours).
"Because experience has shown us that any new offering in this market helps draw additional visitors to our resort".
The new museum accounted single-handedly for 4m of the 5m additional visitors to the institutions financed by the department.
It is projected to deliver 3,000 jobs, and 1.5 million additional visitors and £2.8bn of economic value for Stratford and the surrounding area.
Additional visitor pay parking and permit parking is available in the Roth Way Garage at Roth Way and Campus Drive West.
Its aim was to attract 4.6 million more visitors, £2.3bn in additional visitor-spend, and £1bn of extra investment over the next four years.
A report commissioned by Liverpool City Council found the city had 9.7 million more visitors than normal that year, generating an extra £735m in additional visitor spend across Merseyside.
That's especially true when there's no guarantee that your hard work will result in a single additional visitor from Google.
From an exhibitor's point of view,13 the willingness to rent a stand in the exhibition center depends on his personal value of an additional visitor ((gamma)), on the number of additional sales this exhibitor may expect (that depends on the number of visitors, (vtfrac{e}{j})),14 and on the rental fee, (pi _{j}).
