key 4dForm FSP 4D must be completed by all key individuals of an applicant. 2. A passport number will only be accepted if the person completing the form is not a South African Citizen. 3. RaceKey interpolation Auto tangents A, T 1 Break tangents B, T 2 Zero angle (tangent) 0, T 3 Zero length (tangent) L, T 4 Clamp C, T 5 ar ALT + L, T 6 Step ALT + T, T 7 Soft ALT + S,