The A77 is closed in both direction at Cairnryan in Dumfries and Galloway, due to flooding.
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The cow aims to highlight Neil Armstrong's strong Scottish roots.
For the first time ever, the number has risen above 1,000, up 27% on the previous year.
The well-known sportsman, who played for Queen of the South and Carlisle United, died at the age 96 in April.