凍る and 凍結: frozen roads and a plan temporarily on hold
Compare possible freezing of pond water and an already frozen road with 凍結 for a road or a plan. Read the targets and preserve temporary suspension due to a lack of funds.
Pond water that sometimes freezes and a frozen road
凍る（こおる） means to freeze. 「気温が下がると、池の水が凍ることがあります。」（When the temperature falls, the pond water sometimes freezes.） 気温が下がると supplies the condition, and 凍ることがあります expresses that freezing sometimes occurs. The sentence does not make freezing inevitable whenever temperatures fall.
「濡れた道が凍っていたので、ゆっくり歩きました。」（The wet road had frozen, so we walked slowly.） 凍っていた describes the wet road as already frozen. ので connects that state with walking slowly. Distinguish this past state from the possibility in the pond example.
A road freezing and a plan put on hold
凍結（とうけつ） can refer to freezing. 「夜の冷え込みで道路が凍結した。」（The road froze in the cold of the night.） 道路 is the physical target, and 夜の冷え込みで supplies the reason for the change.
「予算不足のため新しい計画は一時凍結された。」（The new plan was temporarily put on hold due to a lack of funds.） 新しい計画 is the plan suspended due to insufficient funds. 一時 limits the suspension to a temporary one, and 凍結された presents it passively. The plan has not physically become ice or been declared permanently abandoned.
The target and duration identify the sense
池の水, 濡れた道, and 道路 are physical targets of freezing. 新しい計画 is a figurative target whose progress is suspended. Read the target to distinguish an icy state from a pause in a plan.
The plan's stated reason is 予算不足 and its scope is 一時. Securing funds or terminating a contract is not stated. Preserving temporary suspension distinguishes the plan from the physical road example.
How do the targets and duration differ in 「夜の冷え込みで道路が凍結した。」 and 「予算不足のため新しい計画は一時凍結された。」?
Show the answer and why
The first describes a road physically freezing. The second describes a new plan temporarily put on hold due to a lack of funds. Temporary suspension does not become physical ice or permanent cancellation.