CREATE TABLE "classification" (
  "driver" text,
  "constructor" text,
  "laps" real,
  "time_retired" text,
  "grid" real
);

Question: What is the average grid for johnny herbert with a Time/Retired of +1 lap?
SQL: SELECT AVG("grid") FROM "classification" WHERE "time_retired"='+1 lap' AND "driver"='johnny herbert';