Tee times were delayed at the Lorena Ochoa Invitational as congestion issues in Mexico City caused problems for third-round competitors.
Four players in contention were caught in traffic on a shuttle bus that took over two hours to complete the journey from the tournament hotel to the venue.
The decision was taken so that Suzann Pettersen, Angela Stanford, Minjee Lee and Carlota Ciganda avoided disqualification for their late arrival.
"The last three groups of Round 3 of the Lorena Ochoa Invitational have been delayed 53 minutes due to the late arrival of an Official Tournament transportation vehicle," an LPGA statement said.
"The vehicle departed the Official hotel at 9.30am and arrived to Club de Golf Mexico City at 11.46am. The ride to the course, usually taking 15-20 minutes was delayed due to unanticipated road closures and the alternate route in which that particular vehicle took."
The LPGA cited decision 6-3a/1.5 for "exceptional circumstances" beyond the control of the players as their reason for the delay.
Lee, who led the tournament heading into Saturday, and Stanford both produced over-par rounds, the former with a three-over 75 and the latter a four-over 76.
World number one Inbee Park took a three-stroke lead following six birdies.