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The report investigates how the expansion of toll and national roads in the RIMBA Ecosystem Corridor (spanning Riau, Jambi, and West Sumatra) fragments wildlife habitats and degrades ecosystem services. It highlights the critical risk to Sumatran tigers and elephants, noting that road infrastructure acts as a driver for land-use change, including conversion to oil palm and rubber plantations. The study finds that while nature-based solutions like animal underpasses have been implemented, they are often insufficient or fail during rainy seasons. It predicts a decline in carbon storage and water reserves by 2030 and recommends strategic habitat corridors and improved governance of animal crossing facilities to mitigate extinction risks and environmental degradation.