Create ROADMAP.md

First version of SANDAG ABM roadmap.

Author: bhargavasana

ROADMAP.md

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+# 🚦 SANDAG ABM Roadmap
+**Last Updated:** Jan 2026 (Q1 Update)
+**Next Scheduled Review:** April 2026
+
+## 🟢 Now (3-6 months)
+*Target: Prepare model for Aiport Transit Connection (ATC) project*
+- [ ] **Transit Recalibration:** Recalibrate transit ridership using 2023 OBS.
+- [ ] **SDIA Airport Model Update:** Choice model updates and recalibration using 2024 Airport Travel Survey for San Diego International Aiport.
+- [ ] **Taxi/TNC Routing Model Update:** Convert from Java to Python and make behavioral improvements.
+- [ ] **HH AV Allocation Update:** Convert from Java to Python and make behavioral improvements.
+- [ ] **Bike Logsum Update:** Convert from Java to Python and make behavioral improvements.
+
+## 🟡 Next (6-12 months)
+*Target: Initial improvements for 2029 Regional Plan Modeling*
+- [ ] **Population Sim Upgrade:** Upgrade to latest populatiosim version and make process improvements.
+- [ ] **Bike Model Sensitivity:** Perform extensive sensitivity testing and develop assignment procedure in Python.
+- [ ] **Commercial Vehicle Model Update:** Improve performance and behavioral aspects.
+- [ ] **Overall Performance Improvement:** Improve runtime and memory requirements.
+- [ ] **ActivitySim Version Upgrade:** Upgrade to latest suitable ActivitySim version.
+- [ ] **Azure VM Setup:** Seamlessly run the model on cloud.
+
+## 🔵 Later (12+ months)
+*Target: Long-term Innovation*
+- [ ] **AV Enhancement:** Improve treatment of AVs.
+- [ ] **Micro-Transit Enhancement:** Improve treatment of Micro-Transit modes.
+- [ ] **Highway Assigment Updates:** Explore updates to highway assignment processes.
+- [ ] **Transit Assigment Updates:** Explore updates to transit assignment procedures.
+