user: Question: What is the top grid that roger williamson lapped less than 7?
Columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']
Types: ['text', 'text', 'real', 'text', 'real']
Sample row: ['Jackie Stewart', 'Tyrrell - Ford', 72.0, '1:39:12.45', 2.0]
SQL:

assistant: SELECT MAX("Grid") FROM "Table" WHERE "Driver" = 'roger williamson' AND "Laps" < 7.0;