How to create a Table and fill it

Let's say I have 5 highways and I'm checking the colour of cars driving on those highways. The row headers would be the 5 highways (therefore 5 rows, excluding the column headers) and the column headers would be the colours (blue, red, white, black, silver, etc.).

So if I detect a red car on highway 2, I want to put a '1' in the table (row: highway 2, column: red).

How can I do that? I couldn't find anything useful.