Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_34 (laps INTEGER, team VARCHAR, grid VARCHAR)
### Question:
What was the highest lap count for Walker Racing with a grid larger than 15?
### Answer:
SELECT MAX(laps) FROM table_name_34 WHERE team = "walker racing" AND grid > 15