§ 72.050 RIGHT-OF-WAY ON PUBLIC HIGHWAYS.
   When two vehicles approach or enter an intersection from different roadways at approximately the same time, the driver of the vehicle on the left must yield the right-of-way to the vehicle on the right.
(ILCS Ch. 625, Act 5 § 11-901) ('77 Code, § 71.029) Penalty, see § 70.99