Why were tunnels initially added then removed from expressway design?

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Tunnels Removed After Initial Addition Due to Site Condition Reassessments

The tunnels initially incorporated into the Air Itam–Tun Dr Lim Chong Eu Expressway project design were subsequently removed due to further technical assessments of challenging geological conditions and structural stability encountered during construction. The project's design has undergone revisions, with tunnels first being added and later reverted to the original open-cut concept.
Initial Design Revisions Included Tunnels

The initial design for the RM852 million expressway project featured open-cut sections and viaducts. However, this design was subsequently revised to include tunnels, a change that received approval on November 27, 2020. This modification reflected an adaptation to the project's requirements based on initial assessments.
Construction Assessments Led to Further Design Changes

During the construction phase, additional assessments were conducted concerning the geological conditions and the structural stability of the site. These further evaluations indicated a need for design adjustments, prompting a reassessment of the tunnel inclusions.
Tunnels Reverted to Original Open-Cut Concept

Following the detailed assessments of geological factors and structural integrity, the decision was made to revert the tunnel sections back to the original open-cut concept. This latest revision to the design was formally approved by the state government on July 3, 2024, indicating a return to the initial structural approach after exploring tunnel alternatives.

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Why were tunnels initially added then removed from expressway design?

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