The Indus Dictionary Project
This is the noun span with the addition of two hands. The two hands are controlling two animals yoked side by side. Hence, Mahadevan's sign number 1096 is an ideograph for the verb to drive.
Mohenjo-daro: Seal: M-307 a: Jagat Pati Joshi and Asko Parpola, 1987: Corpus of Indus Seals and Inscriptions: Volume 1: Page 76: Collections in India: Suomalainen Tiedeakatemia.
Indus Script Sign Number 1096: List of Sign Variants: Iravatham Mahadevan, 1977: The Indus Script: Texts, Concordance and Tables: The Director General Archaeological Survey of India.