Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
What is the average grid for johnny herbert with a Time/Retired of +1 lap?

### Inputs:
table_name: table, columns: ['Driver', 'Constructor', 'Laps', 'Time/Retired', 'Grid']

### Response:
SELECT AVG Grid FROM table WHERE Time/Retired = +1 lap AND Driver = johnny herbert