Two separate injuries share one name. Spray damage is direct chemical burn: salty slush lands on twigs, buds, and evergreen foliage and desiccates the tissue, killing it outright on the exposed face. Soil damage is systemic: chloride is taken up and accumulates in leaves to toxic levels, while sodium displaces calcium and magnesium on clay particles and collapses soil structure, so the soil holds water the roots can no longer extract. The tree ends up drought-stressed in wet soil and poisoned at the same time. The soil version is the one that kills trees; the spray version disfigures and causes dieback. In Speedway — Old Speedway City (Speedway Historic District), Speedway Manor and Main Street corridor included, that's normally a tree trimming job at $250–$1,400. Within weeks.
Why this comes up in Speedway
AES Indiana (the former Indianapolis Power & Light) serves Speedway. AES states it prunes on an eight-year line-clearance cycle and is an Arbor Day Foundation Tree Line USA utility (every year 2004 through 2025). It removes debris after routine scheduled trimming but not after emergency or hazard-limb work.
Speedway's canopy
No public street-tree inventory has been published for Speedway, so species counts are UNVERIFIED. Because the residential core finished building out by the mid-1950s and has barely been rebuilt since, much of the yard canopy is likely of comparable age and large enough to close over narrow streets and 40-to-50-foot lots — an inference from build-out dates, not a measured finding. The exception is Main Street, where a town streetscape reconstruction installed all-new landscaping, so those trees are recent.
Marion County rules
Indiana has no statewide tree removal permit, and no Speedway ordinance requiring a permit to remove a tree on private property is documented in the sources reviewed. Important caveat: Speedway is an excluded town under Unigov and maintains its own municipal code separate from Indianapolis, and the full Speedway code text could not be retrieved, so the exact local text is UNVERIFIED. Marion County's zoning ordinance does state a purpose of protecting and enhancing tree cover and the countywide code carries a "Trees and Flora" chapter, but the section citations are unconfirmed and whether they bind Speedway is unconfirmed. Call the Speedway Street Department before touching anything near the street line.
The tree lawn in Speedway
The tree lawn is town right-of-way, and critically it is Speedway's right-of-way, not Indianapolis'. Speedway runs its own Street Department rather than relying on Indy DPW, so right-of-way work is cleared with the town. Who bears the cost of removing an existing tree-lawn tree is UNVERIFIED.